Find a Contractor
Contact a Capital For Change Registered Contractor to get an estimate for qualifying improvements.
Find a Contractor in the list below or call 855-656-5500 to find an approved contractor in your area.
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| Company Name | Town | State | Zip | Improvement Types | Website | Phone | |
|---|---|---|---|---|---|---|---|
| 1-800-Plumber & Air | Shelton | CT | 06484 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-965-5959 | |
| 20/20 Air Mechanical Corporation | New Milford | CT | 06776 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-456-1577 | |
| 4-M Plumbing & Heating LLC | Preston | CT | 06365 | Boilers/Furnaces, Central Air Conditioning | Website | 860-886-6857 | |
| 72 Degrees A/C & Heating, LLC | Baltic | CT | 06330 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-591-8085 | |
| A & S Nathan Heating & Cooling, LLC | Ansonia | CT | 06401 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-735-5332 | |
| A First Response HVAC | Berlin | CT | 06037 | Boilers/Furnaces, Central Air Conditioning | Website | 860-880-0012 | |
| A Plus Exterior LLC | Milford | CT | 06460 | Roofing, Siding, Windows/Doors | Website | (203) 685-7121 | |
| A Touch of Air Property Services LLC | Bolton | CT | 06043 | Boilers/Furnaces, Central Air Conditioning | 860-729-3945 | ||
| A&B Cooling & Heating Corp. | South Windsor | CT | 06074 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 860-528-4436 | |
| A+ Plumbing & Heating LLC | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-937-0562 | |
| A-1 Oil Co | Windsor Locks | CT | 06096 | Boilers/Furnaces | Website | 860-627-9474 | |
| A-1 Services, Inc. | Meriden | CT | 06451 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | (203) 238-2147 | |
| A. Troiano & Sons, Inc. | Enfield | CT | 06082 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-745-0321 | |
| A.C Mechanical Services, LLC | East Windsor | CT | 06088 | Central Air Conditioning, Heat Pumps, Boilers, Furnaces | 959-333-9660 | ||
| A.E. Olsen Co, Inc | Southbury | CT | 06488 | Boilers/Furnaces, Central Air Conditioning | Website | 203-264-6571 | |
| A.J. Schiano Air Conditioning & Heating, LLC | Stamford | CT | 06906 | Boilers/Furnaces, Central Air Conditioning | 203-504-5021 | ||
| Aair Systems Technologies, Inc | Oxford | MA | 01540 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 508-829-7740 | |
| ABJ Heating & Cooling LLC | Monroe | CT | 06428 | Boilers/Furnaces, Central Air Conditioning | 203-918-6160 | ||
| Absolute Air Services, LLC | Portland | CT | 06480 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-666-4200 | |
| Absolute Cooling & Heating, LLC | Stamford | CT | 06907 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-998-7100 | |
| Absolute Plumbing & Heating, LLC | Trumbull | CT | 06611 | Boilers/Furnaces, Plumbing | 203-673-8621 | ||
| Accent Windows & Doors, LLC | Simsbury | CT | 06070 | Siding, Windows/Doors | Website | 860-651-4146 | |
| Accu-Temp Mechanical Services, Inc. | Wolcott | CT | 06716 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-879-0101 | |
| Accurate Cooling & Heating Systems LLC | Stamford | CT | 06907 | Boilers/Furnaces, Central Air Conditioning | 203-253-5144 | ||
| Accuray Mechanical LLC | East Haven | CT | 06512 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-467-4671 | |
| Action Solar | Lehi | UT | 84043 | Solar | Website | 385-498-0550 | |
| Action Windows & Siding, LLC | West Hartford | CT | 06110 | Siding, Windows/Doors | Website | 860-953-1936 | |
| Advance HVAC | Branford | CT | 06405 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-444-8076 | |
| Advance Plumbing & Heating, Inc. | Newington | CT | 06111 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-232-3053 | |
| Advanced Heating & Air Conditioning, Inc. | South Windsor | CT | 06074 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Plumbing | Website | (860) 282-0205 | |
| Advanced Mechanical Services LLC | Farmington | CT | 06032 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-404-5865 | |
| Advanced Window Systems, LLC | Berlin | CT | 06037 | Roofing, Siding, Windows/Doors | Website | 860-829-8044 | |
| Aegis Solar Energy, Inc. | Branford | CT | 06405 | Solar | Website | 203-481-2187 | |
| AES Windows & Doors | Fairfield | CT | 06430 | Windows/Doors | Website | 203-650-0702 | |
| Affordable Heating & Air Conditioning, LLC | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-581-4892 | |
| Affordable Heating and Cooling, LLC | Wethersfield | CT | 06109 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-922-2477 | |
| Affordable Home Modification LLC | Milford | CT | 06468 | Boilers/Furnaces, Central Air Conditioning, Electrical, Insulation, Plumbing, Roofing, Siding, Windows/Doors, Roof repair/replacement | 203-767-9544 | ||
| Affordable Home Repair Service | New Haven | CT | 06519 | Boilers/Furnaces, Central Air Conditioning | Website | 203-891-6225 | |
| Aiello Plumbing & Heating | Windsor Locks | CT | 06096 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 888-696-6113 | |
| Air & Water Solutions, LLC | Shelton | CT | 06484 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Plumbing | Website | 203-520-4648 | |
| Air Connections, LLC | Plainville | CT | 06062 | Boilers/Furnaces, Central Air Conditioning | 860-747-8186 | ||
| Air Experts, Inc. | East Longmeadow | MA | 01085 | Heat Pumps | Website | 413-552-0808 | |
| Air Flo Mechanical, LLC | Colchester | CT | 06415 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-989-5079 | |
| Air On Time, LLC | Old Saybrook | CT | 06475 | Air/Duct Sealing, Boilers/Furnaces, Heat Pumps | Website | 860-306-9038 | |
| Air Solutions Inc | Stamford | CT | 06902 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Ductless mini-split heat pump | Website | 203-357-8853 | |
| Air Specialties Air Conditioning & Heating, Inc. | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-934-7984 | |
| Air Temp Mechanical Services, Inc. | Southington | CT | 06489 | Boilers/Furnaces, Central Air Conditioning | Website | 860-953-8888 | |
| Air Unlimited, LLC | Wallingford | CT | 06492 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-238-3213 | ||
| AIR, Inc. | Branford | CT | 06405 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-303-4822 | |
| Aire Serv Heating & Cooling of Western Connecticut | New Milford | CT | 06776 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-717-0563 | |
| Aire Serv of North Central CT | East Windsor | CT | 06088 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-627-8830 | |
| Aire Serv of Southwest Connecticut | Fairfield | CT | 06824 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-736-8952 | |
| Airmax Solutions Heating and Air Conditioning LLC | Milford | CT | 06460 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Electrical, Geothermal, Heat Pumps | Website | 203-675-1656 | |
| AirPlus, Inc. | Norwalk | CT | 06855 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | (203) 854-9751 | ||
| Aitkin Mechanical Services, LLC | Windsor | CT | 06095 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-508-4818 | |
| AK Mechanical Contractors, LLC | Hartford | CT | 06112 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-206-3748 | ||
| Al's Plumbing and Heating | Orange | CT | 06477 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 203-464-1710 | ||
| Albert L. Munroe Jr. Plumbing & Heating, Inc. | Milford | CT | 06460 | Boilers/Furnaces, Plumbing | 203-214-3328 | ||
| Alicki Enterprise Heat & Cool | Orange | CT | 06477 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Plumbing, Roofing, Siding, Windows/Doors | 203-687-0676 | ||
| All American Heating and Air Conditioning, Inc | Wolcott | CT | 06716 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-879-4928 | |
| All Around Mechanical Services Inc | New Milford | CT | 06776 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-350-3639 | |
| All Phase Heating & Cooling, LLC | Milford | CT | 06461 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-927-2829 | ||
| All Pro Heating & Air Conditioning | Ansonia | CT | 06401 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-729-5094 | |
| All Service LLC | New Milford | CT | 06776 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 860-350-0044 | |
| All-Tech Plumbing & Heating LLC | Dayville | CT | 06241 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-515-9596 | |
| All-Time Manufacturing Co. Inc. | Montville | CT | 06353 | Windows/Doors | Website | 860-848-9258 | |
| All-Weather Mechanical, LLC | Bristol | CT | 06011 | Boilers/Furnaces, Central Air Conditioning | Website | 860-584-2875 | |
| Alpha Air Systems, Inc. | Norwalk | CT | 06851 | Boilers/Furnaces, Central Air Conditioning | Website | 203-866-6887 | |
| AM Solutions LLC | Niantic | CT | 06357 | Boilers/Furnaces, Central Air Conditioning | 860-966-0798 | ||
| AMA Environmental, LLC | Ellington | CT | 06029 | Hazardous Material Abatement | Website | 860-796-4530 | |
| American Air Mechanical LLC | Marlborough | CT | 06447 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-622-1693 | |
| American Fuel Oil, Inc. | Coventry | CT | 06238 | Boilers/Furnaces | 860-742-1297 | ||
| American General Building Services, LLC | Old Mystic | CT | 06372 | Insulation, Roofing, Siding, Windows/Doors | 860-514-9565 | ||
| American Heating Service, LLC | Waterbury | CT | 06708 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-756-5040 | |
| American Windows & Siding, LLC | Manchester | CT | 06042 | Insulation, Roofing, Siding, Windows/Doors | Website | 877-410-1227 | |
| Amodio & Sons Fuel & Energy Services | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning | Website | 203-934-2651 | |
| AMP'd Enterprises LLC | Branford | CT | 06405 | Air/Duct Sealing, Insulation | Website | 800-924-2247 | |
| Andersen Oil Co. | Ledyard | CT | 06339 | Boilers/Furnaces, Plumbing | Website | 860-464-7628 | |
| Andrews Oil & Gas Services | South Windsor | CT | 06074 | Boilers/Furnaces | Website | 860-528-0766 | |
| Andy's Oil Service, Inc. | Waterbury | CT | 06704 | Boilers/Furnaces, Central Air Conditioning | Website | 203-756-8969 | |
| Anthony's Abatement LLC | West Hartford | CT | 06107 | Hazardous Material Abatement | Website | 860-966-7663 | |
| APEX Mechanical LLC | Stamford | CT | 06903 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 475-619-9616 | ||
| Apex Refrigeration, Cooling & Heating LLC | Bolton | CT | 06043 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-803-3664 | |
| Aquila Heating & Cooling, LLC | Fairfield | CT | 06824 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-334-4880 | |
| ARC Mechanical LLC | Wolcott | CT | 06716 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Plumbing | 860-378-7532 | ||
| Around the Clock Heating and Cooling, Inc. | North Haven | CT | 06473 | Boilers/Furnaces, Central Air Conditioning | Website | 203-239-2226 | |
| Artisan Building & Remodeling LLC | Middletown | CT | 06457 | Roofing, Siding | Website | 860-759-0296 | |
| Astacio Plumbing and Heating, LLC | Wilton | CT | 06897 | Boilers/Furnaces, Heat Pumps, Plumbing | Website | 203-253-0769 | |
| Atlas Plumbing & Heating LLC | Torrington | CT | 06790 | Boilers/Furnaces, Plumbing | Website | 860-496-9938 | |
| Automatic TLC Energy | Portland | CT | 06480 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-528-4328 | |
| B&S Sheetmetal Co., Inc. | Cheshire | CT | 06410 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-272-0653 | |
| B.E. Stevenson Plumbing & Heating LLC | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | (203) 929-5776 | |
| Bailey Home Improvements | South Windsor | CT | 06074 | Roofing, Siding, Windows/Doors | Website | 860-454-5048 | |
| Baribault Fuel | Oakville | CT | 06779 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-274-3284 | |
| BDM Mechanical LLC | Guilford | CT | 06437 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-464-4206 | ||
| Beckron Heating & Cooling LLC | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning | Website | 203-543-8751 | |
| Bender's Oil Service, Inc. | Lebanon | CT | 06249 | Boilers/Furnaces, Central Air Conditioning | Website | 860-423-6859 | |
| Benedetto Heating & A.C., LLC | Old Lyme | CT | 06371 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-434-1574 | ||
| Benjamin Home Service LLC | Wethersfield | CT | 06109 | Boilers/Furnaces, Central Air Conditioning | Website | 860-888-5946 | |
| Benvenuti Oil Company, Inc. | Waterford | CT | 06385 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-443-6115 | |
| Berkeley Exteriors, Inc. | Milford | CT | 06460 | Air/Duct Sealing, Insulation, Roofing, Siding, Windows/Doors | Website | 203-877-4373 | |
| Best Energy, LLC | Pawcatuck | CT | 06379 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-599-1920 | |
| Better Building Performance, LLC. | Shelton | CT | 06484 | Insulation, Siding, Windows/Doors, Home Energy Audits | Website | 203-538-5665 | |
| Big Dog Mechanical Services LLC | Bristol | CT | 06010 | Boilers/Furnaces, Central Air Conditioning, Plumbing | 860-620-3021 | ||
| Billy Carlson Heating & Air Conditioning LLC | Southington | CT | 06489 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-621-0556 | |
| Bioclean, LLC | Milford | CT | 06460 | Hazardous Material Abatement | Website | 203-283-3912 | |
| Black Bear Heating & Air, LLC | East Granby | CT | 06026 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-413-3133 | |
| Blue Flame Oil Co., Inc | New Haven | CT | 06512 | Boilers/Furnaces, Central Air Conditioning | Website | 203-468-2176 | |
| Boland HVAC Solutions | Glastonbury | CT | 06033 | Boilers/Furnaces, Central Air Conditioning | 860-234-4454 | ||
| Boss Heating and Cooling Inc | Charlestown | RI | 02813 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 401-326-9505 | |
| Bosse Heating & Air Conditioning, LLC | Plantsville | CT | 06479 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-620-0687 | |
| Bourque HC Solutions LLC | Windham | CT | 06280 | Boilers/Furnaces, Heat Pumps | 860-617-7767 | ||
| BP Heating & Cooling, LLC | Oxford | CT | 06478 | Boilers/Furnaces, Central Air Conditioning | 203-641-5480 | ||
| Bridgeworks Heating & Cooling LLC | Plainville | CT | 06062 | Boilers/Furnaces, Central Air Conditioning | Website | 860-747-1888 | |
| Britt-Air | Southport | CT | 06890 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-254-0500 | |
| Brooks Energy | Bristol | CT | 06011 | Boilers/Furnaces, Central Air Conditioning | Website | 860-585-1515 | |
| Brothers Oil Company, Inc. | East Hartford | CT | 06108 | Boilers/Furnaces, Central Air Conditioning | Website | 860-289-9468 | |
| Brunelli Energy, LLC | Bozrah | CT | 06334 | Boilers/Furnaces, Plumbing | Website | 860-889-4442 | |
| Bullseye Refrigeration & A/C, Inc. | East Haven | CT | 06513 | Boilers/Furnaces, Central Air Conditioning | Website | 203-469-4444 | |
| C & R Insulation, Inc. | North Franklin | CT | 06254 | Insulation | Website | (860) 642-4226 | |
| C&C Service LLC | Stamford | CT | 06902 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-323-2866 | |
| C&G's One Hour Heating & Air Conditioning | Torrington | CT | 06790 | Boilers/Furnaces, Central Air Conditioning | Website | 860-482-3400 | |
| C&N Mechanical, Inc. | Glastonbury | CT | 06033 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Plumbing | Website | 860-243-0877 | |
| C-Clear Windows and Doors; Window Depot of Central CT | Waterbury | CT | 06708 | Siding, Windows/Doors | Website | 203-232-1117 | |
| C.W. Knight Oil & Heating LLC | North Windham | CT | 06256 | Boilers/Furnaces | Website | 860-455-0658 | |
| CA Trudeau Plumbing & Heating | Branford | CT | 06405 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-627-9422 | |
| Call the Bee Heating, Cooling, Plumbing & Electrical, LLC | Farmington | CT | 06032 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Plumbing | Website | 860-325-3087 | |
| Cameron Plumbing and Heating Mechanical, LLC | Portland | CT | 06480 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-342-3750 | ||
| Campbell Cooling, LLC | Newington | CT | 06111 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 860-666-2696 | |
| Candlewood Valley Heating & Air Conditioning LLC | New Milford | CT | 06776 | Boilers/Furnaces, Central Air Conditioning, Roofing | Website | (860) 350-1197 | |
| Cariati Mechanical | Clinton | CT | 06413 | Boilers/Furnaces | 860-304-8233 | ||
| Carlson Heating Air & Hot Water, Inc . | Torrington | CT | 06790 | Boilers/Furnaces, Central Air Conditioning | Website | 860-489-4328 | |
| Carmine's Plumbing, Heating & Air Conditioning, LLC | Danbury | CT | 06810 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-791-8089 | |
| Carnot Heating | Pawcatuck | CT | 06379 | Boilers/Furnaces, Electrical, Heat Pumps | 860-917-5879 | ||
| Casey's Climate Partners | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Insulation, Plumbing | Website | 203-263-1068 | |
| Castle Windows | Mt. Laurel | NJ | 08054 | Roofing, Siding, Windows/Doors | Website | 800-360-4400 | |
| Caswell & Sons Contracting LLC | Canterbury | CT | 06331 | Boilers/Furnaces, Heat Pumps, Plumbing | 860-428-9335 | ||
| CAWIAMCA LLC | Old Saybrook | CT | 06475 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | (203) 589-7825 | |
| CBS Contractors Heating & Cooling, Inc. | Ansonia | CT | 06401 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Electrical, Geothermal, Heat Pumps | 203-734-8015 | ||
| CCRT Services, LLC | Broad Brook | CT | 06016 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-414-5643 | ||
| Ceil Plumbing & Heating, Inc. | Pawcatuck | CT | 06379 | Boilers/Furnaces, Heat Pumps, Plumbing | Website | 860-599-9000 | |
| Celco Heating & Air Conditioning | Bridgeport | CT | 06610 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-371-0055 | |
| Central Air, LLC | Brookfield | CT | 06804 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-546-7776 | |
| Charter Oak Mechanical Services, LLC | Manchester | CT | 06042 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-432-8915 | |
| Chase Mechanical, LLC | Southington | CT | 06489 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-307-6575 | ||
| Chernin HVAC & Refrigeration LLC | Waterbury | CT | 06710 | Boilers/Furnaces, Central Air Conditioning | 781-367-6519 | ||
| Chiarillo's HVAC & Plumbing | Bristol | CT | 06010 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-585-8139 | |
| Climate Masters LLC | Clinton | CT | 06413 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-907-5833 | |
| Climatech Mechanical Services, Inc. | Wallingford | CT | 06492 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-269-1600 | |
| CMC Energy Services, Inc. | Wallingford | CT | 06749 | Insulation, Windows/Doors | Website | (203)774-4059 | |
| CNM Heating, Cooling & Piping, LLC | Storrs | CT | 06268 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-933-2085 | |
| Cole Heating & Cooling, Inc. | Seymour | CT | 06483 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-888-0376 | |
| Cole Mechanical, LLC | Woodbury | CT | 06798 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-948-0564 | |
| Collins & Co. | East Windsor | CT | 06088 | Insulation, Masonry | Website | 860-870-9803 | |
| Comfort Solutions Heating and Cooling, LLC | Southington | CT | 06489 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-620-2786 | |
| Complete Comfort Home Services LLC | Middlefield | CT | 06455 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-316-6833 | ||
| Conditioned Air Systems, Inc. | Hamden | CT | 06515 | Boilers/Furnaces, Central Air Conditioning | 203-230-2121 | ||
| Connecticut Air Systems | Milford | CT | 06461 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-877-4070 | |
| Connecticut Airconditioning Sheetmetal Heating LLC | Plainville | CT | 06062 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-919-3631 | ||
| Connecticut Cooling and Heating, Inc. | Bloomfield | CT | 06002 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Roofing | Website | (860) 242-6295 | |
| Connecticut Environment Control, LLC | Westbrook | CT | 06498 | Boilers/Furnaces, Central Air Conditioning | 860-399-6000 | ||
| Connecticut Home Services, Inc. | West Hartford | CT | 06119 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Insulation, Masonry, Plumbing, Roofing, Siding, Windows/Doors | Website | 860-306-0656 | |
| Connecticut Home Solutions, LLC | Wallingford | CT | 06492 | Air/Duct Sealing, Insulation | Website | (800) 621-2965 | |
| Connection Plumbing & Heating, LLC | Orange | CT | 06477 | Boilers/Furnaces, Plumbing | 203-283-7750 | ||
| Controlled Temperatures, Inc | Stamford | CT | 06906 | Boilers/Furnaces, Central Air Conditioning | Website | 203-348-9141 | |
| Cool Heat Mechanical, Inc. | East Granby | CT | 06026 | Boilers/Furnaces, Central Air Conditioning | 860-883-1837 | ||
| Cooling By Chris LLC | Norwalk | CT | 06850 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-223-6111 | |
| Copper Valley Heating & Cooling, LLC | Meriden | CT | 06450 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-599-0401 | ||
| Corbett HVAC Services, LLC | Willimantic | CT | 06226 | Boilers/Furnaces, Central Air Conditioning | Website | 860-942-0183 | |
| Country Mechanical Inc | Sandy Hook | CT | 06482 | Boilers/Furnaces, Central Air Conditioning | 203-223-2290 | ||
| Countywide Mechanical Services LLC | Berlin | CT | 06037 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Plumbing | Website | 860-316-2299 | |
| Cousins Oil Co, Inc. | Bristol | CT | 06010 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-584-1000 | |
| Cowan Heating & Cooling | Voluntown | CT | 06384 | Boilers/Furnaces, Central Air Conditioning | Website | 860-608-5176 | |
| Cromwell Energy, Inc. | Cromwell | CT | 06416 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-635-1234 | |
| Cruz Mechanical Contractors LLC | Beacon Falls | CT | 06403 | Boilers/Furnaces, Central Air Conditioning | 208-490-7118 | ||
| CT Weatherproof Insulation LLC | Stratford | CT | 06615 | Insulation, Home Energy Audits | Website | 203-813-1597 | |
| Curley's Fuel | Windsor | CT | 06095 | Boilers/Furnaces | 860-688-8870 | ||
| Currie's Plumbing Heating & Cooling, Inc. | Oakdale | CT | 06370 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-859-3533 | |
| Custom Air Systems, Inc. | Bridgeport | CT | 06604 | Boilers/Furnaces, Central Air Conditioning | Website | 203-333-1906 | |
| Custom Ventilation LLC | Willington | CT | 06279 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-429-2805 | |
| D&D Heating & Air Conditioning, LLC | Somers | CT | 06082 | Boilers/Furnaces, Central Air Conditioning, Geothermal System | Website | 860-698-9696 | |
| D&V Mechanical Inc. | Westerly | RI | 02891 | Heat Pumps | Website | 401-741-2704 | |
| Dacosta Spray Foam Insulation LLC | Bridgeport | CT | 06606 | Insulation | 203-482-2595 | ||
| Dandelion Energy, Inc. | Peeksill | NY | 10566 | Geothermal | Website | 833-436-4255 | |
| Daniels Energy | Portland | CT | 06480 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | (860) 813-9125 | |
| Davila's Mechanical Services LLC | Manchester | CT | 06040 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-989-8252 | ||
| DDLC Energy | New London | CT | 06320 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-271-2020 | |
| Degree Heating & Cooling | Glastonbury | CT | 06033 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-633-6122 | |
| Deitch Energy, LLC | Hartford | CT | 06105 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-728-5431 | |
| Densmore Oil Company | Stonington | CT | 06378 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-536-7927 | |
| Dependable Energy, Inc. | Prospect | CT | 06712 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-758-5831 | |
| Designed Air Systems, LLC | East Hampton | CT | 06424 | Boilers/Furnaces, Central Air Conditioning | 860-839-2021 | ||
| Desirable Heating and Cooling | Bridgeport | CT | 06606 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-673-5152 | ||
| Diamond Mechanical LLC | Torrington | CT | 06790 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 959-799-3506 | |
| DiGiorgi Roofing & Siding, Inc. | Beacon Falls | CT | 06403 | Roofing, Siding, Windows/Doors | Website | 203-723-6880 | |
| Direct Home Services | Middlefield | CT | 06455 | Boilers/Furnaces, Central Air Conditioning | 860-339-6001 | ||
| DME Ductless and HVAC | Southbury | CT | 06488 | Boilers/Furnaces, Heat Pumps | 203-586-9026 | ||
| DMV Equity, Inc. | Mamaroneck | NY | 10543 | Solar | Website | 808-218-4169 | |
| Don's Heating & Cooling Solutions, LLC | Tolland | CT | 06084 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning | (860) 872-0586 | ||
| Donnelly Heating & A/C Maintenance, Inc | Bethel | CT | 06801 | Boilers/Furnaces, Central Air Conditioning, Plumbing | (203) 744-1045 | ||
| Douglas Mechanical Services, Inc. | Berlin | CT | 06037 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-357-4952 | |
| Douglas Plumbing, Heating & A/C LLC | Farmington | CT | 06032 | Boilers/Furnaces, Central Air Conditioning, Plumbing | 860-677-4522 | ||
| Dr. Energy Saver - Eco Energy Solutions, LLC - Windsor | Windsor | CT | 06095 | Insulation, Windows/Doors | Website | 860-219-0499 | |
| Dr. Energy Saver CT - Seymour | Seymour | CT | 06483 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Insulation | Website | 800-328-1081 | |
| DS Comfort Control LLC | Coventry | CT | 06238 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-729-6697 | ||
| Ductless Homes, LLC | North Branford | CT | 06471 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-208-1398 | |
| Ductworks HVAC Services | Southington | CT | 06489 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-621-6295 | |
| Duncklee, Inc. | Stonington | CT | 06378 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-535-2552 | |
| Dutch Oil Co, Inc. | Moodus | CT | 06469 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-873-3876 | |
| Dwyer Family Fuel | Old Saybrook | CT | 06475 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-388-1867 | |
| Dynamic Building & Energy Solutions LLC | Stonington | CT | 06378 | Air/Duct Sealing, Hazardous Material Abatement, Insulation, Windows/Doors, Mold Remediation | Website | 860-535-8118 | |
| Dynamic Mechanical Heating & Air Conditioning LLC | Plainville | CT | 06062 | Air/Duct Sealing, Central Air Conditioning, Heat Pumps, Plumbing | Website | (860) 589-8367 | |
| E&M Heating & Cooling, LLC | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning | 203-915-3672 | ||
| E.M. Gas Services LLC | Brooklyn | CT | 06234 | Boilers/Furnaces, Plumbing | 860-933-8292 | ||
| Earth Smart Solar | Monroe | CT | 06468 | Solar | Website | 203-200-0084 | |
| Earthlight Technologies, LLC | Ellington | CT | 06029 | Solar | Website | 860-871-9700 | |
| East Coast Mechanical, Inc. | Cheshire | CT | 06410 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-272-6676 | |
| East Hartford Heating and Cooling, LLC | East Hartford | CT | 06108 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-290-9625 | |
| East River Energy, Inc. | Guilford | CT | 06437 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-453-1200 | |
| Eastern Connecticut Heating LLC | Canterbury | CT | 06331 | Boilers/Furnaces | 860-546-6639 | ||
| Eastern Mechanical Services, Inc. | Oxford | CT | 06478 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Plumbing | Website | 203-792-7668 | |
| Eazy Contracting LLC | Meriden | CT | 06450 | Boilers/Furnaces, Central Air Conditioning, Plumbing | 860-881-5847 | ||
| ECO Energy Guard LLC | Canton | CT | 06019 | Insulation | Website | (860) 690-5465 | |
| Eco Home Comfort Systems, LLC | Goshen | CT | 06756 | Boilers/Furnaces, Central Air Conditioning | Website | 860-644-3845 | |
| EcoSmart Home Services, Inc. | East Berlin | CT | 06023 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Insulation, Solar | Website | 860-828-6626 | |
| Edgerton, Inc. | Monroe | CT | 06468 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning | Website | (203)2686279 | |
| Efficient Heating & Cooling, Inc | Stamford | CT | 06902 | Boilers/Furnaces, Central Air Conditioning | 203-323-8740 | ||
| EJB Construction | Jewett City | CT | 06351 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-639-0677 | ||
| Elite Heating and Cooling, LLC | Derby | CT | 06415 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-516-5595 | ||
| EmVee Mechanical LLC | Ellington | CT | 06029 | Boilers/Furnaces, Central Air Conditioning | 860-899-6858 | ||
| Enco Environmental Contracting & Demolition, LLC | Waterbury | CT | 06706 | Hazardous Material Abatement | Website | 203-754-5959 | |
| ENCON, Inc. | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning, Solar | Website | (203) 375-5228 | |
| Energy Air | Guilford | CT | 06437 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 203-453-8354 | |
| Energy Efficiencies Solutions LLC | Windsor | CT | 06095 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Insulation, Windows/Doors | Website | 860-580-9076 | |
| Energy Management Authority LLC | Stratford | CT | 06614 | Air/Duct Sealing, Insulation, Windows/Doors, Home Energy Audits | Website | 203-919-1445 | |
| Energy Unlimited, LLC | Manchester | CT | 06045 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-643-8334 | |
| EnergyMasters LLC | Windsor Locks | CT | 06096 | Air/Duct Sealing, Insulation | Website | 860-834-8890 | |
| Eric Sabo Plumbing Heating & Cooling, LLC | Canterbury | CT | 06331 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-608-4610 | |
| Evergreen Heating and Cooling LLC | Hamden | CT | 06514 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Insulation | Website | 203-288-3315 | |
| Everlast Energy LLC | Berlin | CT | 06037 | Solar | Website | 860-362-3129 | |
| Evolution Air, LLC | Stamford | CT | 06902 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | (203) 724-9814 | ||
| F.F. Hitchcock Co., Inc. | Cheshire | CT | 06410 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-272-5400 | |
| Fahrenheit Mechanical Services, Inc. | Broad Brook | CT | 06016 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-623-1991 | |
| Farmington Valley Home Services, LLC | Goshen | CT | 06756 | Boilers/Furnaces, Central Air Conditioning | 860-480-2545 | ||
| FDX Restoration Inc | Norwalk | CT | 06854 | Hazardous Material Abatement, Mold Remediation | 203-856-8253 | ||
| Finestra Rossa Windows | West Hartford | CT | 06110 | Roofing, Windows/Doors | Website | 860-986-2696 | |
| Fire & Ice Heating and Air Conditioning | Granby | CT | 06035 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-982-0638 | |
| Firehouse Fuels LLC | Harwinton | CT | 06791 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-485-5224 | |
| Fitzgerald & Wood, Inc. | Branford | CT | 06405 | Boilers/Furnaces, Plumbing | 203-488-2553 | ||
| Fitzpatrick Heating & Air Conditioning, LLC | Haddam | CT | 06438 | Boilers/Furnaces, Central Air Conditioning | 860-345-7466 | ||
| Fontaine Mechanical Heating & A/C | Bristol | CT | 06011 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-589-4900 | |
| For U Builders Group, LLC | Morris | CT | 06763 | Insulation, Windows/Doors | Website | 914-582-3169 | |
| Foremost Mechanical Services, LLC | East Windsor | CT | 06088 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-758-4218 | ||
| Fox Heating Service, Inc. | Tolland | CT | 06076 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-684-9113 | |
| Fresh Air Heating & Cooling LLC | Danbury | CT | 06811 | Boilers/Furnaces, Central Air Conditioning | Website | 203-650-1195 | |
| Fritz Air LLC | Harwinton | CT | 06791 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-459-5207 | ||
| Furnace Man | Wallingford | CT | 06492 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | 203-641-5819 | ||
| Future Mechanical, LLC | New Britain | CT | 06051 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-989-7711 | |
| G&G Mechanical | Waterbury | CT | 06705 | Boilers/Furnaces, Central Air Conditioning | 203-565-7879 | ||
| G.J. Giacco, Inc. | Meriden | CT | 06450 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-235-0840 | |
| Gas Works Propane | Yalesville | CT | 06492 | Boilers/Furnaces | Website | 203-269-2082 | |
| Giordano's Heating & Air Conditioning Co., LLC | Derby | CT | 06418 | Boilers/Furnaces, Central Air Conditioning | Website | 203-734-7648 | |
| Glacier Mechanical Services LLC | New Hartford | CT | 06057 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-909-1022 | |
| Glasco Heating & Air Conditioning, Inc. | South Windsor | CT | 06074 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-281-2611 | |
| Glastonbury Burner & Boiler | Glastonbury | CT | 06033 | Boilers/Furnaces, Central Air Conditioning | Website | 860-659-4120 | |
| GM Industries Inc. | Tolland | CT | 06084 | Solar | Website | 860-306-4442 | |
| Gonalc Mechanical Service | Torrington | CT | 06790 | Boilers/Furnaces, Central Air Conditioning | Website | 860-601-5076 | |
| Good Life Energy Savers, LLC | Danbury | CT | 06810 | Insulation | Website | 203-403-6351 | |
| Gottier Plumbing & Heating | Vernon | CT | 06066 | Boilers/Furnaces, Heat Pumps, Plumbing | Website | 860-875-0719 | |
| Green Apple Spray Foam LLC | Guilford | CT | 06437 | Insulation | Website | 203-464-3312 | |
| Green Home Solutions | Old Lyme | CT | 06371 | Hazardous Material Abatement | Website | (860) 418-7588 | |
| Green Mechanicals Heating & Cooling | Stamford | CT | 06907 | Boilers/Furnaces, Central Air Conditioning | Website | 203-243-4925 | |
| Green Power Energy LLC | Annadale | NJ | 08801 | Solar | Website | 844-584-0008 | |
| Greg Glover Plumbing Heating | Shelton | CT | 06484 | Boilers/Furnaces, Heat Pumps, Plumbing | 203-650-5493 | ||
| Greg's Plumbing & Heating, LLC | New London | CT | 06320 | Boilers/Furnaces, Plumbing | 860-460-0670 | ||
| Guaranteed Mechanical Services | Vernon | CT | 06066 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 860-500-6420 | |
| Gulick & Co, LLC | Madison | CT | 06443 | Windows/Doors | 203-996-6151 | ||
| H&M Heating and Cooling LLC | Newington | CT | 06111 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-707-9059 | |
| H. Hulse Heating & Air Conditioning | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-380-2692 | |
| Hagan Mechanical Services LLC | Essex | CT | 06426 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 203-217-8290 | |
| Handyman Express Energy Solutions, LLC | Stratford | CT | 06614 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Insulation, Windows/Doors | Website | 203-307-5395 | |
| Harisi Energy LLC | Watertown | CT | 06795 | Air/Duct Sealing, Hazardous Material Abatement, Insulation | Website | 475-888-0080 | |
| Harmony Home Improvement | South Windsor | CT | 06074 | Roofing, Siding, Windows/Doors | Website | (860)645-8899 | |
| HARP Home Services LLC | Windsor | CT | 06095 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-337-8182 | |
| Harpco Mechanical LLC | Preston | CT | 06365 | Boilers/Furnaces, Central Air Conditioning | 860-334-7874 | ||
| Hefferon Heating & Cooling LLC | Danbury | CT | 06811 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-790-8826 | |
| Helio Solar LLC | Shelton | CT | 06484 | Boilers/Furnaces, Geothermal, Heat Pumps, Insulation, Solar | Website | 203-200-0364 | |
| Hellas Air Temp., Inc. | Norwalk | CT | 06850 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-246-1783 | |
| Hi Ho Petroleum | Bridgeport | CT | 06605 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 2033350101 | |
| Hi-Tech Mechanical Services LLC | West Hartford | CT | 06117 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-726-8458 | |
| High Performance Energy Solutions, LLC | Brookfield | CT | 06804 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 203-297-2529 | |
| Highland Window Company, LLC | West Hartford | CT | 06107 | Siding, Windows/Doors | Website | 860-424-1709 | |
| Hillcrest Heating & Air Conditioning | Ansonia | CT | 06401 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-735-1847 | ||
| Hocon Gas, Inc. | Shelton | CT | 06484 | Boilers/Furnaces, Central Air Conditioning | Website | 203-626-0900 | |
| Hoffman Energy | Trumbull | CT | 06611 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Home Energy Audits | Website | 800-637-2239 | |
| Home Comfort Heating and Cooling Solutions, LLC | East Haven | CT | 06512 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-349-2331 | |
| Home Comfort Practice, LLC | Stratford | CT | 06615 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Insulation, Roofing, Siding, Windows/Doors, Home Energy Audits | Website | 203-450-3000 | |
| Home Doctor of America, LLC | Southbury | CT | 06488 | Insulation, Home Energy Audits | Website | 203-405-3040 | |
| Home Heating & Air Conditioning, LLC | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning | Website | 203-932-5484 | |
| Homestead Fuel, Inc. | Ellington | CT | 06029 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-870-8700 | |
| HomeTown Heating & Cooling LLC | Avon | CT | 06001 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-539-5528 | ||
| HR Heating Services, Inc. | Andover | CT | 06232 | Boilers/Furnaces, Central Air Conditioning, Plumbing | (860) 573-2403 | ||
| Hurricane Energy Heating & Cooling LLC | North Branford | CT | 06471 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-208-4768 | ||
| Husky Energy & Propane LLC | Woodbury | CT | 06798 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-586-1116 | |
| Husky Fuel | Oxford | CT | 06478 | Boilers/Furnaces | Website | 203-888-2082 | |
| Hybrid Services LLC | Woodstock | CT | 06281 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 844-484-4927 | |
| Hydro Dynamic Engineering, LLC | Southington | CT | 06489 | Geothermal | Website | 860-620-7452 | |
| Hygrade Mechanical Services LLC | West Hartford | CT | 06117 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-918-3068 | ||
| Hyper Fusion Heating & Cooling LLC | Shelton | CT | 06484 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-895-5829 | |
| Hyper Heat & Cool LLC | Newington | CT | 06131 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-839-8000 | ||
| Ideal Environments LLC | Seymour | CT | 06483 | Boilers/Furnaces, Central Air Conditioning | 203-260-2071 | ||
| Ideal Mechanical Services, LLC | Tolland | CT | 06084 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | (860) 368-7625 | |
| Imperial Plumbing Co. | South Windsor | CT | 06074 | Boilers/Furnaces, Plumbing | Website | 860-291-0115 | |
| Independent Mechanical Inc. | Uncasville | CT | 06382 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-949-4401 | ||
| Indoor Comfort Heating & Cooling LLC | East Haven | CT | 06512 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-507-8411 | ||
| Infinite HVAC Solutions, LLC | Harwinton | CT | 06791 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-302-7262 | |
| Innovative Heating & Cooling LLC | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-283-7272 | ||
| Insight Solar | Hatfield | MA | 01038 | Solar | Website | 413-341-5360 | |
| Insulation Solutions of CT, LLC | East Hartford | CT | 06108 | Air/Duct Sealing, Insulation, Siding, Windows/Doors, Home Energy Audits | Website | 860-586-8111 | |
| Ion Solar Pros LLC | Wolcott | CT | 06716 | Solar | Website | 860-565-0000 | |
| Irie Energy Heating & Cooling, LLC | Niantic | CT | 06357 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Boilers, Furnaces | 860-334-1823 | ||
| Island Mechanical, LLC | South Windsor | CT | 06074 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-338-4440 | ||
| Ives Brothers, Inc. | Willimantic | CT | 06226 | Boilers/Furnaces, Central Air Conditioning | Website | 860-423-6381 | |
| J Socci Plumbing & Heating | Stamford | CT | 06905 | Boilers/Furnaces, Plumbing | Website | (203) 569-3996 | |
| J&J Silver City Remodeling | Meriden | CT | 06451 | Insulation, Roofing, Siding, Windows/Doors | 203-715-8156 | ||
| J&M Plumbing and Heating LLC | Bantam | CT | 06750 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | (860) 567-0508 | ||
| J. Gasper Heating and Air Conditioning | Torrington | CT | 06790 | Boilers/Furnaces, Central Air Conditioning | Website | 860-496-0101 | |
| J. Thurston Fuel LLC | Waterbury | CT | 06708 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-720-3028 | |
| J.C. Tonnotti Window Co. Inc. | Southington | CT | 06489 | Roofing, Siding, Windows/Doors | Website | 860-621-1642 | |
| J.M. Cipriano & Sons, LLC | Prospect | CT | 06712 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | (203) 758-3770 | |
| J.P. Dunn Heating & Cooling, LLC | Northfield | CT | 06778 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-283-1167 | |
| James Carboni Plumbing & Heating Inc. | North Franklin | CT | 06254 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-642-7847 | |
| Jasinski Fuel Service, LLC | Harwinton | CT | 06791 | Boilers/Furnaces, Central Air Conditioning | Website | 860-605-9039 | |
| JB Mechanical LLC | Marlborough | CT | 06447 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-918-4129 | ||
| JD Heating LLC | Newton | CT | 06470 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-648-0238 | ||
| JD Solar Solutions LLC | Bolton | CT | 06043 | Solar | Website | 860-717-0786 | |
| Jennings Propane Company | Danbury | CT | 06810 | Boilers/Furnaces, Central Air Conditioning | Website | 203-790-1406 | |
| Jim's Heating and A/C Co., LLC | Southbury | CT | 06488 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-217-0554 | |
| JJ Sullivan Oil & Propane | Guilford | CT | 06437 | Boilers/Furnaces, Central Air Conditioning | Website | 203-453-2781 | |
| JLP Heating & Cooling LLC | Norwalk | CT | 06851 | Boilers/Furnaces, Central Air Conditioning | Website | 203-524-0297 | |
| JMC Plumbing, LLC | Newtown | CT | 06470 | Boilers/Furnaces, Plumbing | 203-788-4157 | ||
| JMM Construction LLC | Brookfield | CT | 06804 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Insulation, Masonry, Plumbing, Roofing, Siding, Windows/Doors | 203-948-6536 | ||
| Joe the Plumber | South Windsor | CT | 06074 | Boilers/Furnaces, Plumbing | Website | 860-614-7157 | |
| Joe's Home Improvement, LLC | East Windsor | CT | 06088 | Roofing, Siding, Windows/Doors | 860-904-3845 | ||
| John's Plumbing & Heating, LLC | Bloomfield | CT | 06002 | Boilers/Furnaces, Plumbing | 860-242-4909 | ||
| Jones Heating Service, LLC | Willington | CT | 06279 | Boilers/Furnaces | 860-429-1599 | ||
| Jordan's Heating-Cooling LLC | Hamden | CT | 06514 | Boilers/Furnaces | 203-230-2194 | ||
| Joseph S. Sabino Plumbing & Heating, LLC | Norwalk | CT | 06854 | Boilers/Furnaces, Plumbing, High efficiency boiler | 203-325-1622 | ||
| JP Carroll Roofing | Bloomfield | CT | 06002 | Roofing, Siding, Windows/Doors | Website | 860-586-8857 | |
| JP Heating & Cooling, LLC | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning | Website | 203-385-3837 | |
| JP Parks Heating and Cooling LLC | Woodbury | CT | 06798 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-560-6795 | |
| JT Home Services LLC | Sherman | CT | 06784 | Insulation | 203-809-6809 | ||
| Just Right Heating & Cooling, LLC | Waterbury | CT | 06705 | Boilers/Furnaces, Central Air Conditioning | Website | 203-617-9088 | |
| Justin Nuno HVAC & Plumbing LLC | North Windham | CT | 06256 | Boilers/Furnaces, Central Air Conditioning | Website | 959-444-6688 | |
| JV Mechanical Contractors, Inc. | Webster | MA | 01570 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 508-943-3222 | |
| Keith Heating & Cooling LLC | Danielson | CT | 06239 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-377-0116 | ||
| Kelley's Heating & Cooling LLC | New Milford | CT | 06776 | Heat Pumps | Website | 860-717-4226 | |
| Kenair LLC | East lyme | CT | 06333 | Heat Pumps | 860-235-6743 | ||
| Kennedy's Plumbing & Heating | Hartford | CT | 06114 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-296-4867 | |
| King Energy LLC | Lebanon | CT | 06249 | Geothermal | Website | 860-420-7134 | |
| Klebe Energy | Winsted | CT | 06098 | Boilers/Furnaces, Plumbing | Website | 860-738-1114 | |
| KMK Mechanical LLC | Old Lyme | CT | 06371 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-626-6772 | |
| Koala Insulation of Central CT | Glastonbury | CT | 06073 | Insulation | Website | 860-815-9355 | |
| Koala Insulation of Eastern CT | Manchester | CT | 06042 | Insulation | Website | 860-264-6976 | |
| Koala Insulation of Southern Connecticut | Shelton | CT | 06484 | Insulation | Website | 203-646-3772 | |
| Kool Energy Technology, LLC | Mount Vernon | NY | 10552 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 347-789-0789 | |
| L&L Mechanical, LLC | Goshen | CT | 06756 | Boilers/Furnaces, Central Air Conditioning | 860-491-4007 | ||
| L.C. Mechanical LLC | East Hartford | CT | 06108 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-593-1102 | ||
| L.H. Gault & Son Inc. | Westport | CT | 06880 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | (203) 227-5181 | |
| LA Mechanical Services LLC | Rocky Hill | CT | 06067 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-371-5459 | |
| Labbe Heating & Cooling LLC | Watertown | CT | 06795 | Boilers/Furnaces, Central Air Conditioning | Website | 860-274-7615 | |
| Landucci Heating & Cooling, Inc. | Torrington | CT | 06790 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-496-0114 | |
| Lantern Energy, LLC | Glastonbury | CT | 06033 | Insulation, Home Energy Audits | Website | 877-878-3006 | |
| Leahy's Fuels, Inc. | Danbury | CT | 06810 | Boilers/Furnaces | Website | 203-748-3539 | |
| Levco Tech Inc. | Trumbull | CT | 06611 | Boilers/Furnaces, Central Air Conditioning | Website | (203) 846-6500 | |
| Link Mechanical Services, Inc. | New Britain | CT | 06051 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 860-826-5880 | |
| Linton Heating & Plumbing LLC | Stamford | CT | 06902 | Boilers/Furnaces, Central Air Conditioning | Website | 203-820-0622 | |
| Litchfield County Mechanical | Harwinton | CT | 06791 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-601-2621 | |
| Long Hill Oil | Clinton | CT | 06413 | Boilers/Furnaces, Central Air Conditioning | Website | 860-664-3835 | |
| Lovett Heating and Cooling LLC | Broad Brook | CT | 06016 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-372-5775 | ||
| M&M Heating & Cooling, LLC | Bridgeport | CT | 06606 | Boilers/Furnaces, Central Air Conditioning | 203-377-5866 | ||
| M&M Mechanical, LLC | Wolcott | CT | 06716 | Boilers/Furnaces, Central Air Conditioning | Website | 203-721-7477 | |
| M&M Mechanical, M&M Oil | Bolton | CT | 06043 | Boilers/Furnaces, Central Air Conditioning | Website | 860-649-2871 | |
| M&R Mechanical Services LLC | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | (203) 874-7914 | |
| M.C. Electrical Contractors LLC | West Hartford | CT | 06119 | Electrical | Website | 860-883-8655 | |
| M.J. Emonds Mechanical Contractors LLC | Glastonbury | CT | 06033 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-657-4554 | |
| M.J. Williams Heating & A/C Inc. | Woodstock | CT | 06281 | Boilers/Furnaces, Central Air Conditioning | 508-949-0035 | ||
| MAC Heating and Cooling | Waterbury | CT | 06706 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-217-9041 | |
| Macca Plumbing & Heating | Hartford | CT | 06114 | Boilers/Furnaces, Heat Pumps, Plumbing | Website | 860-560-1200 | |
| MacDonald + Co Plumbing LLC | Torrington | CT | 06790 | Boilers/Furnaces, Plumbing | 860-626-0204 | ||
| Marandola Fuel Service, LLC | New Milford | CT | 06776 | Boilers/Furnaces | Website | 860-355-4877 | |
| Marzano Plumbing and Heating Co., Inc. | Hartford | CT | 06114 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-296-9624 | |
| Massey Heating & Cooling, LLC | Monroe | CT | 06468 | Boilers/Furnaces, Central Air Conditioning, Plumbing | 203-650-1530 | ||
| Massimo Heating and Cooling, LLC | Oakville | CT | 06779 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 888-316-2774 | |
| MCK Heating and Cooling LLC | Norwalk | CT | 06855 | Boilers/Furnaces, Central Air Conditioning | 203-515-9939 | ||
| MCR Refrigeration, LLC | Dayville | CT | 06241 | Boilers/Furnaces, Central Air Conditioning | 860-382-5977 | ||
| Mechanitech HVAC Solutions LLC | Bethlehem | CT | 06751 | Boilers/Furnaces, Central Air Conditioning | Website | 203-592-1775 | |
| Michael Tobin Plumbing, LLC | Sandy Hook | CT | 06482 | Boilers/Furnaces, Plumbing | 203-788-7624 | ||
| Mid-State Mechanical Contractors | Middletown | CT | 06457 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-635-3230 | |
| Middlesex Mechanical Services LLC | Portland | CT | 06480 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-949-5711 | ||
| MidState HVAC & R/Oil | Hope Valley | RI | 02832 | Heat Pumps | 401-641-7848 | ||
| Miele Mechanical Services LLC | New Britain | CT | 06051 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-539-9234 | ||
| Mike's Mechanical Services | Wolcott | CT | 06716 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 203-808-3630 | ||
| Mike's Plumbing Services LLC | Fairfield | CT | 06825 | Boilers/Furnaces, Central Air Conditioning | 203-223-8286 | ||
| Millas Heating & Cooling LLC | Mystic | CT | 06355 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-415-9962 | |
| Miller Oil Company | Enfield | CT | 06082 | Boilers/Furnaces, Central Air Conditioning | Website | 860-745-0320 | |
| Millstream Construction LLC | Glastonbury | CT | 06033 | Roofing, Siding, Windows/Doors | Website | 860-288-5805 | |
| Minutemen Plumbing & Heating | Colebrook | CT | 06021 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-806-7070 | |
| Mirabito Energy Products | Binghamton | NY | 13902 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 607-352-2902 | |
| Mitchell Fuel Co., Inc. | South Windsor | CT | 06074 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-644-2561 | |
| MJ Fahy & Sons, Inc. | Waterbury | CT | 06702 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-574-4808 | |
| Mobilio and Son HVAC, LLC | Cheshire | CT | 06410 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-404-0471 | |
| Modern Heating & Air Conditioning LLC | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-283-0593 | |
| Modern Home Solutions CT LLC | Norwich | CT | 06360 | Roofing, Siding | Website | 860-864-4314 | |
| Montanari Fuel Service, Inc. | Ridgefield | CT | 06877 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-438-2688 | |
| MR Heating & Cooling LLC | Harwinton | CT | 06791 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-459-1908 | |
| Mr. G's Heating & Cooling | Norwich | CT | 06360 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-303-0344 | ||
| MTL Heating & Cooling LLC | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning | Website | 203-619-1267 | |
| Mull Brothers, Inc | Wethersfield | CT | 06109 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-529-8255 | |
| Mullen Mechanical Heating & Cooling | East Hartford | CT | 06118 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Plumbing | Website | 860-328-2657 | |
| Nadile Enterprises | Meriden | CT | 06451 | Boilers/Furnaces, Plumbing | 203-525-2066 | ||
| Nealon Insulation | Clinton | CT | 06413 | Insulation | Website | 860-669-0333 | |
| Nero Air Conditioning, Heating & Refrigeration, Inc. | North Haven | CT | 06473 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 203-248-8110 | |
| New England Building Products | Meriden | CT | 06450 | Insulation, Roofing | Website | (203) 235-7981 | |
| New England Green Homes LLC | Stafford | CT | 06076 | Insulation, Windows/Doors | 860-930-7794 | ||
| New England Heating and Air Conditioning, LLC | North Branford | CT | 06471 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 203-488-7904 | |
| New England Performance Insulation, LLC | Milford | CT | 06460 | Air/Duct Sealing, Insulation | Website | 203-783-0748 | |
| New England Property Pros LLC | Plainville | CT | 06062 | Boilers/Furnaces, Heat Pumps | Website | 860-335-9634 | |
| New England Smart Energy Group, LLC | Fairfield | CT | 06824 | Air/Duct Sealing, Boilers/Furnaces, Heat Pumps, Insulation, Windows/Doors | Website | 203-292-8088 | |
| New England Total Energy | Greenwich | CT | 06830 | Boilers/Furnaces, Central Air Conditioning | Website | 800-260-5954 | |
| New Era Mechanical Services LLC | New Britain | CT | 06053 | Boilers/Furnaces, Central Air Conditioning | 860-395-9700 | ||
| New Generation Heating & Cooling, LLC | Hartford | CT | 06106 | Boilers/Furnaces, Central Air Conditioning | Website | 860-597-4524 | |
| Newgate Oil Company Inc. | West Hartford | CT | 06110 | Boilers/Furnaces, Central Air Conditioning | Website | 860-953-9999 | |
| NexGen Energy, LLC | Rocky Hill | CT | 06067 | Insulation, Home Energy Audits | Website | 860-436-5849 | |
| Non-Stop Heating & Cooling, LLC | North Haven | CT | 06473 | Boilers/Furnaces, Central Air Conditioning | (203) 410-9360 | ||
| Norbert E. Mitchell Co., Inc. | Danbury | CT | 06810 | Boilers/Furnaces, Central Air Conditioning | Website | 203-744-0600 | |
| Northern Comfort Services LLC | Prospect | CT | 06712 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-439-7723 | |
| Nu-Face of CT LLC | Plantsville | CT | 06479 | Roofing, Siding, Windows/Doors | Website | 860-681-3002 | |
| Nunes Quality Plumbing & Heating, LLC | Windsor | CT | 06095 | Boilers/Furnaces, Plumbing | Website | 860-688-8709 | |
| Nutmeg Mechanical Services, Inc. | Manchester | CT | 06042 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-643-2042 | |
| Olivares Improvement Contractor, LLC | Bridgeport | CT | 06607 | Boilers/Furnaces, Central Air Conditioning, Insulation, Roofing, Siding, Windows/Doors | 203-449-8827 | ||
| Omni Mechanical Services, LLC | South Windsor | CT | 06074 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 8604224314 | ||
| One Hour Heating & Air Conditioning - Terryville | Terryville | CT | 06782 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-589-8979 | |
| One Hour Heating & Air Conditioning of Shelton | Derby | CT | 06418 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps | Website | 203-442-9307 | |
| Onofreo Home Comfort Systems, LLC | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-301-4151 | |
| Ortiz Refrigeration, AC & Heating | New Milford | CT | 06776 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-799-6283 | |
| Ortiz Spray Foam Insulation | Danbury | CT | 06810 | Insulation | Website | 475-280-7545 | |
| OSA Heating & Cooling, LLC | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-338-0371 | |
| P.L. Canestri Plumbing & Heating LLC | Guilford | CT | 06437 | Boilers/Furnaces, Plumbing | Website | 203-453-1306 | |
| Pack-Timco, Inc. | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-847-8781 | |
| Paraco HVAC, Chickos Energy Services, Cole Heating & Cooling, Husky Fuel | West Haven | CT | 06516 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 800-325-9815 | |
| Paragon Heating and Cooling LLC | New Milford | CT | 06776 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 475-296-4750 | |
| Parker Home Services LLC | Old Saybrook | CT | 06475 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-934-8441 | ||
| Paul Burdick Oil Co, LLC | Old Saybrook | CT | 06475 | Boilers/Furnaces | Website | (860) 388-1130 | |
| Pelletier Mechanical Services, LLC | Thomaston | CT | 06787 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-283-0316 | |
| Pennywise Oil Company, Inc. | Westbrook | CT | 06498 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-399-8244 | |
| Perfect Wall LLC | East Haven | CT | 06473 | Insulation | Website | 203-829-1556 | |
| Perfetto Construction Inc. | Milford | CT | 06460 | Electrical, Insulation, Plumbing, Roofing, Siding, Windows/Doors | Website | 203-996-7324 | |
| Peter Kupchick Heating & Cooling, Inc | Fairfield | CT | 06825 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-259-9787 | |
| Peters Mechanical LLC | Chester | CT | 06412 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-772-5387 | ||
| Petro Home Services - North Haven | North Haven | CT | 06473 | Boilers/Furnaces, Central Air Conditioning | Website | 888-735-5651 | |
| PHS Mechanical LLC | Shelton | CT | 06484 | Boilers/Furnaces, Central Air Conditioning | 203-395-2188 | ||
| Platinum Design & Building Corp | Niantic | CT | 06357 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Plumbing | 877-277-0415 | ||
| Plumbing Creations, LLC | Hartford | CT | 06114 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | (860) 604-2589 | |
| Plymouth Oil Service, Inc. | Plymouth | CT | 06782 | Boilers/Furnaces | Website | 860-283-6651 | |
| PM Mechanical LLC | Windsor Locks | CT | 06096 | Boilers/Furnaces, Central Air Conditioning | 860-805-1545 | ||
| PosiGen Solar Solutions | Bridgeport | CT | 06610 | Solar | Website | 504-293-4819 | |
| Potters Oil Service, Inc. | North Windham | CT | 06256 | Boilers/Furnaces, Central Air Conditioning | Website | 860-423-1684 | |
| Precise HVAC Home Services LLC | Bristol | CT | 06010 | Boilers/Furnaces, Central Air Conditioning | Website | 860-222-9907 | |
| Precision Mechanical LLC | Manchester | CT | 06040 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-878-7927 | |
| Preferred Air Systems, Inc | Brookfield | CT | 06804 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-778-6286 | |
| Premier Improvements LLC | West Hartford | CT | 06107 | Roofing, Solar, Windows/Doors | Website | 203-233-7139 | |
| Prime Plumbing, Heating, & Cooling LLC | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-954-7053 | |
| Prime Time Heating LLC | Middletown | CT | 06457 | Boilers/Furnaces, Central Air Conditioning | 860-834-8797 | ||
| Pronto Plumbing & Heating, Inc | Bethel | CT | 06801 | Boilers/Furnaces, Plumbing | 203-223-4644 | ||
| PSC Mechanical | Bristol | CT | 06010 | Boilers/Furnaces, Central Air Conditioning | 860-479-0543 | ||
| Quality Home Systems Heating and Air Conditioning, LLC | Berlin | CT | 06037 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-827-9682 | ||
| Quality Mechanical Corporation | East Haven | CT | 06512 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | (203) 467-6712 | |
| Quality Propane, Inc. | Clinton | CT | 06413 | Boilers/Furnaces | Website | 860-669-4277 | |
| Quiet Corners Mechanical Services LLC | North Windham | CT | 06256 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-423-8560 | |
| R & E Heating and Air Conditioning, LLC | Terryville | CT | 06786 | Boilers/Furnaces, Central Air Conditioning | Website | 860-970-9050 | |
| R&B Refrigeration, Air Conditioning & Heating | Guilford | CT | 06437 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-453-6831 | |
| R&J Insulation Co. LLC | Trumbull | CT | 06611 | Insulation | 203-216-3808 | ||
| R&R Heating and Cooling | Bridgeport | CT | 06606 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Insulation | Website | 203-371-0200 | |
| R&R Plumbing & Heating, Inc. | Manchester | CT | 06040 | Boilers/Furnaces, Plumbing | Website | (860) 649-6574 | |
| R&W Heating, LLC | Salem | CT | 06420 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | (860) 846-9993 | |
| Ralph Mann & Sons, Inc. | Ansonia | CT | 06401 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 800-995-6266 | |
| Rapid Plumbing Service, Inc. | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-934-8628 | |
| Raps Plumbing & Heating, Inc. | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-876-1212 | |
| Ray Page Plumbing, Inc. | Vernon | CT | 06066 | Boilers/Furnaces, Plumbing | Website | 860-926-4842 | |
| RCD Heating & Cooling LLC | Plantsville | CT | 06479 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-728-8556 | ||
| RCL Plumbing LLC | Watertown | CT | 06795 | Boilers/Furnaces, Plumbing | 203-528-1537 | ||
| Reed Mechanical Solutions LLC | Southington | CT | 06489 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-637-7641 | |
| Regal Mechanical & Home Improvement Inc. | South Richmond Hill | NY | 11419 | Boilers/Furnaces, Central Air Conditioning | 929-603-4770 | ||
| Reliable Heating Air Conditioning Co. | Killingworth | CT | 06419 | Boilers/Furnaces, Central Air Conditioning | 860-663-6000 | ||
| Reliable Mechanical Contractors LLC | Windsor | CT | 06095 | Boilers/Furnaces | 860-683-2959 | ||
| Renewal by Andersen of Southern New England | Lincoln, RI | RI | 02865 | Windows/Doors | Website | 401-228-9800 | |
| Renshaw Plumbing, Heating & Cooling LLC | New London | CT | 06320 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-447-3903 | |
| Renz Heating and Air Conditioning LLC | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-877-2224 | ||
| Reutter Mechanical, LLC | Ellington | CT | 06029 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Insulation | Website | 860-729-4640 | |
| Rick's Plumbing Service, Inc. | Milford | CT | 06460 | Boilers/Furnaces, Plumbing | Website | 203-516-4542 | |
| Riki HVAC LLC | West Haven | CT | 06516 | Boilers/Furnaces, Central Air Conditioning | 203-893-2339 | ||
| Riley Plumbing & Heating Co., Inc. | Kensington | CT | 06037 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-225-1534 | |
| RLD Heating & Cooling, Inc. | Killingworth | CT | 06419 | Boilers/Furnaces, Central Air Conditioning | Website | 860-663-3181 | |
| Roger Crampton Plumbing & Heating | Old Lyme | CT | 06371 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Plumbing | Website | 860-434-2200 | |
| Roman Oil Company, Inc. | Meriden | CT | 06450 | Boilers/Furnaces | Website | 203-235-3371 | |
| Rose Plumbing & Heating | Hamden | CT | 06514 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 203-996-2129 | ||
| Rousseau Plumbing & Heating, LLC | North Haven | CT | 06473 | Boilers/Furnaces, Plumbing | Website | 203-288-9090 | |
| Rudolph Renovation | New Milford | CT | 06776 | Insulation, Windows/Doors | 347-675-2417 | ||
| Rural Energy LLC | Trumbull | CT | 06611 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-364-5816 | |
| Rutkowski Plumbing & Heating Contractors | New Britain | CT | 06053 | Boilers/Furnaces, Plumbing | Website | 860-223-8569 | |
| Ryan F. Murphy Heating & Cooling, LLC | New Milford | CT | 06776 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-994-4953 | |
| Ryan Oil Company Inc. | Hamden | CT | 06514 | Boilers/Furnaces, Central Air Conditioning | Website | 203-248-6984 | |
| S.D.R. Plumbing & Heating, Inc. | Stamford | CT | 06902 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-348-2295 | |
| Santa Energy | Bridgeport | CT | 06605 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-362-3332 | |
| Saucier Mechanical Services Inc. | Plantsville | CT | 06479 | Boilers/Furnaces, Central Air Conditioning | Website | 860-628-9999 | |
| SAVKAT Inc | Bristol | CT | 06010 | Solar | Website | 860-288-7557 | |
| Schede Plumbing & Heating | Stamford | CT | 06906 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-969-2299 | |
| Scotti Mechanical Services, LLC | Waterford | CT | 06385 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning | Website | 860-460-5617 | |
| Select Mechanical Services Inc. | Southington | CT | 06489 | Boilers/Furnaces, Central Air Conditioning | Website | 860-681-6818 | |
| Sensible Mechanical LLC | Stafford Springs | CT | 06076 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-670-1882 | |
| Servco Oil, Inc. | Bridgeport | CT | 06601 | Boilers/Furnaces, Central Air Conditioning | Website | 203-762-7994 | |
| Service Relief LLC | Manchester | CT | 06492 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-400-0016 | |
| Service Stars, Inc. | Danbury | CT | 06811 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-763-4044 | |
| Seven Sun LLC | New Britain | CT | 06053 | Windows/Doors | Website | 860-357-5177 | |
| Seymour Energy Services LLC | Seymour | CT | 06483 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-888-1700 | |
| SG Heating & Cooling LLC | Durham | CT | 06422 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-537-3781 | ||
| Shaffer Beacon Mechanical LLC | Bristol | CT | 06010 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-583-1363 | |
| Shelton Insulation and Gutters LLC | Shelton | CT | 06484 | Insulation | Website | 203-868-7960 | |
| Shelton Oil and Heating | Shelton | CT | 06484 | Boilers/Furnaces, Central Air Conditioning | Website | 203-538-7145 | |
| Shippee Solar and Construction LLC | Putnam | CT | 06260 | Solar | Website | 860-450-2345 | |
| Silberman Heating and Cooling LLC | Wallingford | CT | 06492 | Boilers/Furnaces, Central Air Conditioning | 203-605-2236 | ||
| Silver City Furnace Co. Inc. | Meriden | CT | 06450 | Boilers/Furnaces, Central Air Conditioning | Website | 203-237-0995 | |
| Sippin Energy Products | Monroe | CT | 06468 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | (203) 261-3668 | |
| Skye Mechanical Services LLC | Wolcott | CT | 06716 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 203-808-3630 | ||
| SM Mechanical Services LLC | Glastonbury | CT | 06033 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-368-1572 | |
| SM Welch LLC | Glastonbury | CT | 06033 | Insulation, Roofing, Siding, Windows/Doors | Website | 860-295-1295 | |
| Smart Thermal Solutions LLC | Pawcatuck | CT | 06379 | Boilers/Furnaces, Central Air Conditioning, Electrical, Geothermal, Heat Pumps | Website | 860-373-8040 | |
| SMR Heating and Cooling, LLC | Middletown | CT | 06457 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-729-9616 | ||
| Solar Energy Resources, LLC | Thomaston | CT | 06787 | Solar | Website | 860-880-8300 | |
| Solvit Home Services | Plainville | CT | 06062 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Insulation, Plumbing | Website | (860) 747-2000 | |
| South Shore Heating & Cooling Inc. | Pawcatuck | CT | 06379 | Boilers/Furnaces, Central Air Conditioning | Website | 860-599-5370 | |
| Spicer Advanced Gas | Groton | CT | 06340 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-445-2436 | |
| Spray Tech Insulation, LLC | Berlin | CT | 06057 | Insulation | Website | 860-621-3000 | |
| Stafford Mechanical Services, Inc. | Stafford Springs | CT | 06076 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Plumbing | Website | 860-684-9485 | |
| Standard Oil of CT, Inc. | Bridgeport | CT | 06610 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 800-822-3835 | |
| State Line Propane/Oil | Granby | CT | 06035 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | (860) 653-8076 | |
| Steve Basso Plumbing Heating & A/C, LLC | Bridgeport | CT | 06610 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-335-0224 | |
| Stratus Mechanical Services LLC | Naugatuck | CT | 06770 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-687-2872 | |
| Summer Hill Solar LLC | Woodstock | CT | 06281 | Solar | Website | 860-867-7027 | |
| Superior Comfort Heating & AC LLC | Ansonia | CT | 06401 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-736-6309 | |
| Superior Energy, LLC | Vernon | CT | 06066 | Boilers/Furnaces | Website | 860-875-6221 | |
| Superior HVAC & Tank Removal | Waterbury | CT | 06708 | Boilers/Furnaces, Central Air Conditioning | Website | 203-755-7400 | |
| Superior Remodelers LLC | Newtown | CT | 06470 | Insulation, Roofing, Siding, Windows/Doors | Website | 888-330-8148 | |
| Synergy Smart Homes LLC | Colchester | CT | 06415 | Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Solar | Website | 860-222-0958 | |
| T&A Mechanical, LLC | Brooklyn | CT | 06234 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-234-1760 | |
| T&H Mechanical Systems LLC | Norwalk | CT | 06855 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-644-1440 | |
| T&S Heating & Air Conditioning LLC | Portland | CT | 06480 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-342-1506 | |
| T. Mednick Services, LLC | Milford | CT | 06460 | Boilers/Furnaces, Plumbing | 203-815-5485 | ||
| T.A.P. Plumbing and Heating, LLC | Bristol | CT | 06011 | Boilers/Furnaces, Plumbing | Website | 860-302-7117 | |
| Tait Heating and Cooling LLC | Wilton | CT | 06897 | Boilers/Furnaces, Central Air Conditioning | 203-948-3728 | ||
| Tasse Fuel Corporation | Southbridge | MA | 01550 | Boilers/Furnaces, Central Air Conditioning | Website | 508-765-0841 | |
| Taylor Energy | Broad Brook | CT | 06016 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | (860) 623-3308 | |
| TC Plumbing & Heating, LLC | Bloomfield | CT | 06002 | Boilers/Furnaces, Plumbing | 860-250-7359 | ||
| TecKnow Smart Living Ecosystems | Westport | CT | 06880 | Solar | Website | 203-832-5669 | |
| Ted's Plumbing & Heating, Inc | West Hartford | CT | 06110 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-569-0501 | ||
| Temp Assure HVAC LLC | Bridgeport | CT | 06604 | Boilers/Furnaces, Central Air Conditioning | Website | 203-621-4496 | |
| Terrys Energy LLC | Berlin | CT | 06037 | Boilers/Furnaces, Central Air Conditioning, Plumbing | 860-333-4664 | ||
| The Energy Store, LLC | Newton | CT | 06470 | Air/Duct Sealing, Insulation, Windows/Doors | Website | 860-480-9294 | |
| The Guild Plumbing and Heating | Chester | CT | 06412 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Plumbing | Website | 860-510-6899 | |
| The HDL Co. LLC | Lisbon | CT | 06351 | Boilers/Furnaces, Central Air Conditioning | 860-334-2970 | ||
| The Home Energy Pros LLC | Newtown | CT | 06470 | Insulation | Website | 203-731-0702 | |
| The Stielau Oil Co. Inc. | Middletown | CT | 06457 | Boilers/Furnaces, Central Air Conditioning | Website | 860-347-1497 | |
| Thermal Works LLC | Southington | CT | 06489 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | 860-919-2767 | ||
| Thermo Care LLC | Stamford | CT | 06906 | Boilers/Furnaces, Central Air Conditioning | Website | 203-595-9321 | |
| Thomaston Comfort Control, Inc. | Thomaston | CT | 06787 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-283-9939 | |
| Titan Enterprises Inc. | Ansonia | CT | 06401 | Masonry, Roofing, Siding, Windows/Doors | 203-395-1480 | ||
| TNT Heating & Cooling LLC | Colchester | CT | 06415 | Boilers/Furnaces, Central Air Conditioning | 860-334-3667 | ||
| Tomax Heating & Cooling | Orange | CT | 06477 | Boilers/Furnaces, Central Air Conditioning | Website | 203-298-0756 | |
| Top Notch Home Solution LLC | Cromwell | CT | 06416 | Insulation | Website | 860-770-3883 | |
| Top Tier Fuel LLC | Windsor Locks | CT | 06074 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-502-5944 | |
| Total Comfort Control, LLC | Guilford | CT | 06437 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-484-9698 | |
| Total Comfort, Inc. | Danbury | CT | 06810 | Boilers/Furnaces, Central Air Conditioning | Website | 203-791-2141 | |
| Total Mechanical Systems, LLC | Plainville | CT | 06062 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-314-1518 | |
| Total Refrigeration LLC | West Suffield | CT | 06093 | Boilers/Furnaces, Central Air Conditioning | 860-668-1459 | ||
| Toth Mechanical LLC | Shelton | CT | 06484 | Boilers/Furnaces, Central Air Conditioning | 203-993-0606 | ||
| Tower Energy, LLC | Plainville | CT | 06062 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-793-1239 | |
| Town Oil Company, Inc. | Wethersfield | CT | 06109 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-529-6813 | |
| Tracey Energy Services, LLC | New Haven | CT | 06519 | Central Air Conditioning, Heat Pumps | Website | 203-777-5747 | |
| Trade Services, LLC | Berlin | CT | 06037 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-778-9142 | ||
| TradeTwins LLC | Watertown | CT | 06795 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 203-558-6939 | |
| Tri Tech Mechanical, LLC | Stamford | CT | 06902 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-359-3399 | |
| Tri-City Heating and Cooling LLC | Milford | CT | 06460 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Insulation | Website | 203-303-5700 | |
| Tri-Town Mechanical, LLC | Jewett City | CT | 06351 | Boilers/Furnaces, Central Air Conditioning | 860-376-4277 | ||
| Trident Mechanical Services | Farmington | CT | 06085 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 860-716-0334 | ||
| Tripoint HVAC LLC | Milford | CT | 06460 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | 203-298-8599 | ||
| Trovarelli Plumbing & Heating, LLC | Stratford | CT | 06614 | Boilers/Furnaces, Heat Pumps, Plumbing | 203-209-7780 | ||
| TruVue LLC | Trumbull | CT | 06611 | Electrical, Insulation, Plumbing, Roofing, Siding, Windows/Doors | 203-650-3601 | ||
| Tuscany Design Build | South Windsor | CT | 06074 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Electrical, Geothermal, Heat Pumps, Plumbing, Windows/Doors | Website | 860-881-1025 | |
| Twin Mechanical, LLC | Madison | CT | 06443 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-687-1442 | |
| Tyler Heating, Air Cond. & Refrigeration LLC | Stratford | CT | 06615 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 203-378-4700 | |
| Ugo DiGrazia Air Conditioning & Heating, Inc. | Hartford | CT | 06114 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-296-1281 | |
| Uplands Construction Group, LLC | North Stonington | CT | 06359 | Insulation, Windows/Doors | 860-535-8118 | ||
| US Insulation Corp. | West Hartford | CT | 06110 | Insulation | Website | 860-829-8881 | |
| Valiant Energy Solutions | Waterbury | CT | 06722 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Electrical, Heat Pumps, Insulation, Plumbing | Website | 800-992-2227 | |
| Valley Air Conditioning and Heating, Inc | Simsbury | CT | 06070 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-658-0371 | |
| Valley Oil | Portland | CT | 06480 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 866-297-8038 | |
| Ventrella Mechanicals | Trumbull | CT | 96611 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning | 203-246-6577 | ||
| Venture Home Solar, LLC | Southington | CT | 06489 | Electrical, Solar | Website | 888-522-9161 | |
| Viglione Heating & Cooling Inc. | East Haven | CT | 06512 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-467-8388 | |
| Viglione Pipeworks LLC | Orange | CT | 06477 | Boilers/Furnaces, Plumbing | 203-499-7796 | ||
| Viking Fuel Oil Co., Inc. | West Hartford | CT | 06117 | Boilers/Furnaces, Central Air Conditioning | Website | 860-233-6225 | |
| West Hartford Windows, LLC | West Hartford | CT | 06107 | Insulation, Roofing, Siding, Windows/Doors | Website | 860-410-6107 | |
| West Side Oil Company | West Suffield | CT | 06093 | Boilers/Furnaces, Central Air Conditioning, Plumbing | Website | 860-668-4322 | |
| Wilcox Energy, Inc. | Westbrook | CT | 06498 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-399-6218 | |
| William Perotti and Sons Inc | East Canaan | CT | 06024 | Boilers/Furnaces, Central Air Conditioning, Geothermal, Heat Pumps, Plumbing | Website | 860-824-5181 | |
| Williams Plumbing & Heating Inc | Bridgeport | CT | 06606 | Boilers/Furnaces, Plumbing | 203-414-3177 | ||
| Windham County Sheet Metal Inc. | Quinebaug | CT | 06262 | Boilers/Furnaces, Central Air Conditioning | Website | 860-935-5153 | |
| Window World of Connecticut | Manchester | CT | 06042 | Siding, Windows/Doors | Website | 860-643-4568 | |
| Wittig Mechanical, LLC | Ellington | CT | 06029 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps, Plumbing | Website | 860-454-0334 | |
| wtech22 Heating and Cooling | Trumbull | CT | 06611 | Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 203-540-9973 | |
| Wyman Energy Services, Inc. | Manchester | CT | 06045 | Air/Duct Sealing, Boilers/Furnaces, Central Air Conditioning, Heat Pumps | Website | 860-643-2453 | |
| Yankee Home Improvement, Inc. | Northampton | MA | 01060 | Insulation, Roofing, Siding, Windows/Doors | 413-341-5259 | ||
| Yankee Oil, Inc. | Mansfield | CT | 06250 | Boilers/Furnaces, Central Air Conditioning | Website | 860-423-9111 | |
| Year-Round Mechanical, LLC | Meriden | CT | 06451 | Boilers/Furnaces, Central Air Conditioning | 203-843-4579 | ||
| Your Home Improvement Company LLC | Enfield | CT | 06082 | Roofing, Siding, Windows/Doors | Website | 860-281-2292 |