| Air Benders HVAC LLC | Curtis Albert Guerr Blas | mn@tritonair.net | (760) 917 6364 | HVAC | Escondido · San Diego County | — | — |
| Air Climate Solutions | Petrosian Roman | airclimatesolutions@yahoo.com | (619) 894 1886 | HVAC | Encinitas · San Diego County | — | — |
| Air Cool Heating And Air Conditioning | Charles Steven Plount | spannell@whitemechanical.com | (760) 212 2425 | HVAC | Fallbrook · San Diego County | — | — |
| Air Crafts Heating & Air Conditioning INC | Kelly Marie Hernandez | — | (760) 749 3667 | HVAC | Valley Center · San Diego County | — | — |
| Air Direct Heating & AC | Gary Jerome Brufach | airdirect2007@gmail.com | (760) 788 9339 | HVAC | Ramona · San Diego County | — | — |
| Air Express Heating & Cooling | Ronald William Glassi | — | (619) 820 7689 | HVAC | Santee · San Diego County | — | — |
| Air Flohs | Corey Brent Flohs | eben@eyebytes.com | (858) 748 6437 | HVAC | Poway · San Diego County | — | — |
| Air King | Air King | info@air-king.com | (760) 739 8750 | HVAC | Escondido · San Diego County | — | — |
| Air Logik | Air Logik | steved@precision-ac.com | (619) 252 9698 | HVAC | San Diego · San Diego County | — | — |
| Air Marshalls | Air Marshalls | mn@tritonair.net | (619) 756 1259 | HVAC | Carlsbad · San Diego County | — | — |
| Air Nova | Air Nova | service@airnova.ac | (858) 308 0088 | HVAC | Chula Vista · San Diego County | — | — |
| Air Plus Heating & Cooling | James Owen Crawford | — | (858) 505 8711 | HVAC | San Diego · San Diego County | — | — |
| Air Pro Home Services INC | Nathaniel Melvin Shea | steved@precision-ac.com | (619) 273 3157 | HVAC | Chula Vista · San Diego County | — | — |
| Air Pros Mechanical | Air Pros Mechanical | james@airprosmech.com | (619) 905 6036 | HVAC | Ramona · San Diego County | — | — |
| Air Quality Control Heating & Air Conditioning | Arturo Jr Lara | arturo@airqualitycontrolheating.com | (760) 520 3466 | HVAC | Escondido · San Diego County | — | — |
| Air Stream Heating & Cooling INC | Richard John Springsteen | — | (619) 861 9779 | HVAC | El Cajon · San Diego County | — | — |
| Air Support Heating & Air Conditioning | Joseph Hilary Hunt | steved@precision-ac.com | (619) 204 4251 | HVAC | San Diego · San Diego County | — | — |
| Air Systems Mechanical INC | Edward Francis Engle | buildzoomsupport@blockrenovation.com | (619) 697 0265 | HVAC | La Mesa · San Diego County | — | — |
| Air Tech Mechanical | Air Tech Mechanical | steved@precision-ac.com | (858) 758 0616 | HVAC | San Diego · San Diego County | — | — |
| Air Temperature Control HVAC INC | Angel D Torres-Cruz | mn@tritonair.net | (760) 214 5523 | HVAC | Vista · San Diego County | — | — |
| Air Temperature Specialists | Charles Nathaniel Jines | — | (888) 588 1602 | HVAC | El Cajon · San Diego County | — | — |
| Air Time Heating & Air | Air Time Heating & Air | — | (760) 908 5076 | HVAC | Oceanside · San Diego County | — | — |
| Air To The Throne DBA Wilson Heating And Air | Kenneth Allen Wilson | — | (760) 415 4380 | HVAC | Carlsbad · San Diego County | — | — |
| Air-vac Systems Contracting | Scott A Miller | — | (619) 444 4830 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Airandvac.com | Donald Ray Kouns | — | (619) 562 3060 | Other | El Cajon · San Diego County | — | — |
| Airation Heating And Air | William Christopher Shipman | — | (619) 724 8821 | HVAC | El Cajon · San Diego County | — | — |
| Airborne Plumbing INC | Aaron Christopher Maples | — | (619) 607 2893 | Other | Spring Valley · San Diego County | — | — |
| Aircon Climate Solutions INC | Cesar Diaz | cool@airconclimatesolutions.com | (619) 381 2426 | HVAC | National City · San Diego County | — | — |
| Aire Theater Designs INC | Seth Aire Maxton | — | (619) 459 5064 | Other | San Diego · San Diego County | — | — |
| Airecare Heating And Air | Michael Santana | info@aircareha.com | (760) 500 1697 | HVAC | Escondido · San Diego County | — | — |
| Aireforce Heating & Air INC | Kayla Alysse Hughes | info@aireforce.com | (619) 448 2470 | HVAC | Santee · San Diego County | — | — |
| Airist Heating And Air Conditioning | Konstantin Vladimirovic Sheverdyayev | mn@tritonair.net | (619) 246 2998 | HVAC | Escondido · San Diego County | — | — |
| Airmaxx INC | Aleksander Glozman | support@airmaxx.com | (619) 655 3010 | HVAC | San Diego · San Diego County | — | — |
| Airmerica Air Conditioning & Heating INC | Ryan Joseph Boyle | info@airmerica.com | (619) 398 7579 | HVAC | Vista · San Diego County | — | — |
| Airtime Plumbing Heating And Air | Pedro Manuel Espinoza | — | (760) 908 5076 | HVAC | Oceanside · San Diego County | — | — |
| Airwave Mechanical INC | Clinton James Funk | cfunk@airwavemechanical.com | (760) 294 2271 | HVAC | San Marcos · San Diego County | — | — |
| Airwerx Commercial Services INC | Emory Austin Fox | steved@precision-ac.com | (619) 666 5062 | HVAC | Alpine · San Diego County | — | — |
| Airx Utility Surveyors INC | Stephen Arthur Tueting | — | (760) 480 2347 | Other | San Marcos · San Diego County | — | — |
| Aj Drywall | Aj Drywall | — | (619) 792 5309 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Aj Gallegos Construction INC | Arturo Josafat Gallegos | buildzoomsupport@blockrenovation.com | (619) 697 0777 | Other roofers | Chula Vista · San Diego County | — | — |