| A + General Construction INC | Chiu Kan Wong | — | (415) 602 2585 | HVAC | San Francisco · San Francisco County | — | — |
| A Daniele & Company | Anthony Thomas Daniele | — | (707) 766 4235 | HVAC | San Francisco · San Francisco County | — | — |
| Abco Mechanical Contractors INC | Nicholas Shawn Lanthier | — | (415) 648 7135 | HVAC | San Francisco · San Francisco County | — | — |
| AC Heating And Cooling Service Inc. | AC Heating And Cooling Service Inc. | — | (415) 333-9903 | HVAC | San Francisco · San Francisco County | — | — |
| Ace Plumbing & Rooter | Jonathan Neil Millington | — | (415) 824 6444 | HVAC | San Francisco · San Francisco County | — | — |
| Agbayani Construction Corporation | Vincent Douglas Agbayani | — | (650) 994 9380 | HVAC | San Francisco · San Francisco County | — | — |
| Air Flow Pros Heating And Air Conditioning | Air Flow Pros Heating And Air Conditioning | — | (628) 214-4401 | HVAC | San Francisco · San Francisco County | — | — |
| Air Perfection Heating & Air Conditioning INC | Jonathan Micah Takesh Shorter | — | (415) 590 2934 | HVAC | San Francisco · San Francisco County | — | — |
| All-electric California | Marc Jonathan Loran | allelectriccalifornia@gmail.com | (415) 430 7817 | HVAC | San Francisco · San Francisco County | — | — |
| Alpha Bay Builders INC | Sherman Shuntsun Chiu | — | (415) 282 6188 | HVAC | San Francisco · San Francisco County | — | — |
| Anderson Rowe & Buckley INC | Richard I Jr Buckley | — | (415) 282 1625 | HVAC | San Francisco · San Francisco County | — | — |
| Andy's Mechanical | Andy's Mechanical | — | (415) 309 7786 | HVAC | San Francisco · San Francisco County | — | — |
| Apex Electric & Air | Lusheng Liu | — | (415) 587 8729 | HVAC | San Francisco · San Francisco County | — | — |
| Apollo Heating And Ventilating | Apollo Heating And Ventilating | — | (415) 585 3635 | HVAC | San Francisco · San Francisco County | — | — |
| Arch Plumbing INC | Guadalupe Guillermo Gonzalez | — | (415) 375 0302 | HVAC | San Francisco · San Francisco County | — | — |
| Aremtech INC | Apramjeet Singh Ghuman | — | (415) 467 5409 | HVAC | San Francisco · San Francisco County | — | — |
| Associated Heating Of S F | Associated Heating Of S F | — | (415) 585 0145 | HVAC | San Francisco · San Francisco County | — | — |
| Associated Heating Of San Francisco INC | Rodney Charles Kettell | — | (415) 585 0145 | HVAC | San Francisco · San Francisco County | — | — |
| Astorga Construction INC | Emilio Amilcar Sr Moran | — | (415) 846 6896 | HVAC | San Francisco · San Francisco County | — | — |
| Ayoob & Peery Plumbing Co INC | Josephine Salangsang Mchugh | — | (415) 550 0975 | HVAC | San Francisco · San Francisco County | — | — |
| B D Unique Construction Company | Bi Sheng Deng | — | (415) 217 9728 | HVAC | San Francisco · San Francisco County | — | — |
| B H Chen INC | Humphrey Yong Hui Chen | — | (415) 401 8257 | HVAC | San Francisco · San Francisco County | — | — |
| Bacon Plumbing Co INC | Shayne David Bacon | — | (628) 867 7575 | HVAC | San Francisco · San Francisco County | — | — |
| Bay Air Heating & Cooling | Brittany Janee Kesler | — | (530) 412 3933 | HVAC | San Francisco · San Francisco County | — | — |
| Bay Area Comfort Solutions | Bay Area Comfort Solutions | captaincomfort510@gmail.com | (925) 266-3678 | HVAC | San Francisco · San Francisco County | — | — |
| Bay Area Pipe & Equipment INC DBA Bay Area Mechanical | Mara Anne Kitching | — | (925) 642 9768 | HVAC | San Francisco · San Francisco County | — | — |
| Berco | Richard Frank Dewey | — | (415) 466 6338 | HVAC | San Francisco · San Francisco County | — | — |
| Best Degree HVAC LLC | Best Degree HVAC LLC | — | (415) 239-5233 | HVAC | San Francisco · San Francisco County | — | — |
| Bill Green Jr DBA National Chimney | National Chimney | — | (650) 787 2295 | HVAC | San Francisco · San Francisco County | — | — |
| Bing's Heating & Cooling Co | Bing Kew Yee | — | (415) 309 6127 | HVAC | San Francisco · San Francisco County | — | — |
| Bon Air Services | Dan Toubiana | info@bonairservices.com | (415) 552 2352 | HVAC | San Francisco · San Francisco County | — | — |
| Building Efficiency INC | David Keola Hamburger | — | (415) 831 4535 | HVAC | San Francisco · San Francisco County | — | — |
| Bullard's Heating & Air INC | Joseph Michael Bullard | — | (415) 621 1987 | HVAC | San Francisco · San Francisco County | — | — |
| C R Reichel Engineering Co INC | Michael John Valadao | — | (415) 431 7100 | HVAC | San Francisco · San Francisco County | — | — |
| Cabrillo Plumbing Heating & Air | Cabrillo Plumbing Heating & Air | support@discovercabrillo.com | (650) 343-4700 | HVAC | San Francisco · San Francisco County | — | — |
| Central Mechanical Co | Jerry Ying-chau Cheng | — | (415) 290 0502 | HVAC | San Francisco · San Francisco County | — | — |
| Claddagh Refrigeration Company INC | John Anthony Coyne | — | (415) 643 9248 | HVAC | San Francisco · San Francisco County | — | — |
| Clever Heating And Cooling | Chong Hun Park | — | (415) 385 8224 | HVAC | San Francisco · San Francisco County | — | — |
| Coolrite Refrigeration INC | Manuel Vartan Nazerian | — | (415) 640 7951 | HVAC | San Francisco · San Francisco County | — | — |
| Cornely Company | John James Gray | — | (415) 252 1800 | HVAC | San Francisco · San Francisco County | — | — |