| 1 Aircare HVAC | Hrek Oleksandr | — | (209) 281 5663 | HVAC | Oakdale · Stanislaus County | — | — |
| 108 Mechanical | 108 Mechanical | — | (209) 648 2371 | HVAC | Knights Ferry · Stanislaus County | — | — |
| 3 Elements Heating & Cooling INC | Paul Samuel Mcgill | — | (209) 202 1000 | HVAC | Newman · Stanislaus County | — | — |
| A J Construction And R H Vac | Ajeet Singh Atwal | — | (209) 814 0255 | HVAC | Ceres · Stanislaus County | — | — |
| A L Affordable INC | Anischenko Leonard | — | (209) 863 8101 | HVAC | Modesto · Stanislaus County | — | — |
| A Plus Services Heating And Air INC | Juan Carlos Ramirez | — | (209) 900 3017 | HVAC | Salida · Stanislaus County | — | — |
| A S A P Heating & Air Conditioning | Christopher James Michener | — | (209) 522 4958 | HVAC | Modesto · Stanislaus County | — | — |
| A&n Mechanical INC | Pedro Jesus Alba Nevado | — | (209) 281 9605 | HVAC | Modesto · Stanislaus County | — | — |
| Ac/dc Heating & Air Conditioning | Ac/dc Heating & Air Conditioning | — | (650) 250 3319 | HVAC | Modesto · Stanislaus County | — | — |
| Addington Air INC | Jason Alex Addington | addingtonairinc@gmail.com | (209) 876 1724 | HVAC | Patterson · Stanislaus County | — | — |
| Affordable Heating & Cooling | Affordable Heating & Cooling | info@affordableheatingcooling.com | (925) 483 0521 | HVAC | Oakdale · Stanislaus County | — | — |
| Air Experts Heating & Air | Air Experts Heating & Air | — | (209) 602 9721 | HVAC | Riverbank · Stanislaus County | — | — |
| Air Heroes | Kimberly Jean Bailey | — | (209) 527 4066 | HVAC | Modesto · Stanislaus County | — | — |
| Air Kustoms INC | Juan Jr Zarate | — | (209) 614 8252 | HVAC | Patterson · Stanislaus County | — | — |
| Air Star Heating & Air Conditioning & Construction | Garcia Reginaldo | — | (209) 968 9388 | HVAC | Oakdale · Stanislaus County | — | — |
| Air Systems | Air Systems | — | (209) 652 0399 | HVAC | Ceres · Stanislaus County | — | — |
| Air Tech Services INC | Larry Joe Jr Gwartney | — | (209) 551 4444 | HVAC | Modesto · Stanislaus County | — | — |
| Air Techs Mechanical INC | Walid Ahmed Mashrah | — | (510) 927 6675 | HVAC | Patterson · Stanislaus County | — | — |
| Air Zone HVAC INC | Jimenez Alejandro | — | (209) 996 8160 | HVAC | Modesto · Stanislaus County | — | — |
| Airgentix LLC | Wary San | — | (209) 778 7847 | HVAC | Turlock · Stanislaus County | — | — |
| Airmergency INC | Jaymon Douglas Jordan | airmergencyllc@gmail.com | (209) 498 9444 | HVAC | Modesto · Stanislaus County | — | — |
| Airpossible Heating And Air | Airpossible Heating And Air | — | (209) 573 3159 | HVAC | Patterson · Stanislaus County | — | — |
| Airrows Heating And Air LLC | Brett Jacob Houser | — | (678) 997 5010 | HVAC | Modesto · Stanislaus County | — | — |
| Ajax Heating And Air Conditioning | Ajax Heating And Air Conditioning | — | (209) 360 5270 | HVAC | Modesto · Stanislaus County | — | — |
| Alkire Construction | Terry Lynn Alkire | — | (209) 531 1666 | HVAC | Ceres · Stanislaus County | — | — |
| All Care Services Heating & Air | Gallegos Hector | — | (209) 252 1168 | HVAC | Turlock · Stanislaus County | — | — |
| Alta California H V A C | Frank Anthony Quiroga | — | (510) 589 3880 | HVAC | Patterson · Stanislaus County | — | — |
| Amerine Systems Incorporated | Gary Dean Amerine | — | (209) 847 5968 | HVAC | Oakdale · Stanislaus County | — | — |
| Andrade's Air | Andrade's Air | — | (209) 602 8946 | HVAC | Modesto · Stanislaus County | — | — |
| Armored Air | Armored Air | — | (209) 281 4100 | HVAC | Modesto · Stanislaus County | — | — |
| Armstrong Refrigeration | Armstrong Refrigeration | — | (209) 518 0208 | HVAC | Turlock · Stanislaus County | — | — |
| Artemio Duarte HVAC | Artemio Duarte HVAC | — | (650) 248 4515 | HVAC | Modesto · Stanislaus County | — | — |
| Atlantis Heating LLC | Theodore Ross Prepoutse | — | (209) 996 2848 | HVAC | Modesto · Stanislaus County | — | — |
| Be In Comfort | Be In Comfort | — | (209) 678 6746 | HVAC | Turlock · Stanislaus County | — | — |
| Beacon Heating & Air LLC | Jordan Robert Soto | — | (209) 505 5125 | HVAC | Modesto · Stanislaus County | — | — |
| Bnh Mechanical LLC | Balkar Singh Hayer | — | (408) 373 8614 | HVAC | Modesto · Stanislaus County | — | — |
| Bret Turner Heating & Cooling | Bret Turner Heating & Cooling | — | (209) 595 5186 | HVAC | Modesto · Stanislaus County | — | — |
| Brown Sheet Metal And Mechanical INC | Cathy Rene Brown | — | (209) 847 0336 | HVAC | Oakdale · Stanislaus County | — | — |
| Bun's HVAC Services INC | Bunpeov Ing | — | (209) 604 0133 | HVAC | Modesto · Stanislaus County | — | — |
| C & J Heating And Air Conditioning | Jason Joseph Soriano | — | (209) 430 1862 | HVAC | Riverbank · Stanislaus County | — | — |