| 1-888-heat-pumps | John Linus Grimsich | — | (888) 432 8786 | HVAC | Berkeley · Alameda County | — | — |
| 3rdgen Home Services DBA 3rdgen Heating And Cooling | Devin Rodolfo Osorio | — | (866) 222 7980 | HVAC | Berkeley · Alameda County | — | — |
| 4-seasons Heating & Air Conditioning | Rodriguez Alexander | — | (510) 886 3112 | HVAC | Castro Valley · Alameda County | — | — |
| A & B Mechanical INC | Deborah Gail Byrkit | — | (510) 264 5800 | HVAC | Hayward · Alameda County | — | — |
| A C Logix Incorporated | Christopher Andre Mosser | — | (925) 846 9991 | HVAC | Pleasanton · Alameda County | — | — |
| A H Construction | Hassine Avner | sales@ahconstruction.com | (408) 210 5277 | HVAC | Fremont · Alameda County | — | — |
| A J Heating & Cooling INC | Jose Garnica-Flores | — | (510) 489 2382 | HVAC | Union City · Alameda County | — | — |
| A M E Heating & Air Conditioning | Rafeeq Zakaa Muhammad | — | (510) 773 3133 | HVAC | Hayward · Alameda County | — | — |
| A Sanchez Mechanical | A Sanchez Mechanical | — | (877) 359 1758 | HVAC | Fremont · Alameda County | — | — |
| A T Weber Plumbing & Mechanical Services INC | Andrew Todd Weber | — | (510) 523 0628 | HVAC | Alameda · Alameda County | — | — |
| A-1 American Plumbing Heating And Air Conditioning | David Michael Le May | — | (510) 581 0607 | HVAC | San Leandro · Alameda County | — | — |
| A/c Guys Cooling And Heating INC | Ulises Alcantara | — | (925) 596 8888 | HVAC | Pleasanton · Alameda County | — | — |
| Aarvaks Heating & Air Conditioning | Jason Alan Hanson | — | (510) 848 5010 | HVAC | Berkeley · Alameda County | — | — |
| Absolute Air Solutions | Rudolph Christopher Delphino | — | (510) 901 7166 | HVAC | Hayward · Alameda County | — | — |
| Ackley Sheetmetal INC | Dennis Craig Ackley | support@ackind.net | (510) 760 9879 | HVAC | Hayward · Alameda County | — | — |
| Advance Heating And Air Conditioning | Advance Heating And Air Conditioning | — | (408) 593 5564 | HVAC | Newark · Alameda County | — | — |
| Advance Heating And Cooling Works | Advance Heating And Cooling Works | — | (510) 776 4372 | HVAC | Hayward · Alameda County | — | — |
| Advanced Home Energy INC | Thomas Gamburg | — | (510) 540 4860 | HVAC | Berkeley · Alameda County | — | — |
| Advanced Refrigeration | Advanced Refrigeration | — | (510) 415 7982 | HVAC | Oakland · Alameda County | — | — |
| Affordable Heating And Air Conditioning | Affordable Heating And Air Conditioning | — | (510) 825 5079 | HVAC | Castro Valley · Alameda County | — | — |
| Afterglow Hydronic Heating | Mniska Able Lamb | — | (510) 485 0550 | HVAC | Berkeley · Alameda County | — | — |
| Air Concepts INC | Charles William Gjers | info@airconcepts.com | (408) 489 2465 | HVAC | Livermore · Alameda County | — | — |
| Air Excel INC | Hardeep Singh Lell | — | (510) 206 8576 | HVAC | Union City · Alameda County | — | — |
| Air Solutions LLC | Renan Montano Estores | — | (510) 573 6474 | HVAC | Livermore · Alameda County | — | — |
| Air Zone Mechanical | Air Zone Mechanical | — | (415) 377 0202 | HVAC | San Leandro · Alameda County | — | — |
| Aircal Heating | Ralph Fernandes Neves | — | (510) 715 8490 | HVAC | Fremont · Alameda County | — | — |
| Airice HVAC Services | Danny Joe Rice | — | (510) 304 5122 | HVAC | Fremont · Alameda County | — | — |
| Airstars Corp | Rafael Fernando Barrios Marroquin | — | (510) 999 1656 | HVAC | Hayward · Alameda County | — | — |
| Airteks.com INC | Jerome Bernard Iii Bohland | — | (925) 292 0148 | HVAC | Livermore · Alameda County | — | — |
| Ais Heating & Air Conditioning INC | Asmir Sojkic | — | (510) 792 4328 | HVAC | Livermore · Alameda County | — | — |
| Ais Heating And Air Conditioning | Asmir Sojkic | — | (510) 792 4328 | HVAC | Livermore · Alameda County | — | — |
| Alameda Island Heating & Air Conditioning LLC | Sean Schuyler Schaefer | — | (510) 710 5571 | HVAC | Alameda · Alameda County | — | — |
| Alaniz HVAC Services | Martinez Marcelo Alaniz | — | (650) 544 6607 | HVAC | Hayward · Alameda County | — | — |
| Alaska Refrigeration Air Conditioning & Heating Co | Dagoberto Tique Sanchez | — | (510) 261 9202 | HVAC | Oakland · Alameda County | — | — |
| Albert Nahman Plumbing Heating And Cooling | Michael Lowell Dauenhauer | — | (805) 543 4881 | HVAC | Alameda · Alameda County | — | — |
| All About Air | All About Air | — | (510) 538 2247 | HVAC | Hayward · Alameda County | — | — |
| All Air Equipment - Installation Professionals | Derek Michel Caponigro | — | (925) 462 3883 | HVAC | Pleasanton · Alameda County | — | — |
| All Bay Contractors INC | George Ramirez Chapa | al@allbaycontractors.com | (650) 444-4485 | HVAC | Fremont · Alameda County | — | — |
| All Seasons Heating & Air Conditioning | Jones Dean | — | (510) 917 3016 | HVAC | Oakland · Alameda County | — | — |
| Alpes Cooling & Heating | Alpes Cooling & Heating | — | (650) 921 7609 | HVAC | Hayward · Alameda County | — | — |