| 100 Degree Mechanical | 100 Degree Mechanical | — | (209) 278 7271 | HVAC | Stockton · San Joaquin County | — | — |
| 4 G Heating & Air | 4 G Heating & Air | — | (209) 594 5392 | HVAC | Manteca · San Joaquin County | — | — |
| A & A Climate Controls | A & A Climate Controls | — | (209) 663 1288 | HVAC | Stockton · San Joaquin County | — | — |
| A + Heating And Air Conditioning | Michael Anese Musa Haddad | — | (209) 366 3850 | HVAC | Stockton · San Joaquin County | — | — |
| A B Heating & Air Conditioning Services | Luong Hong Tran | — | (209) 298 1411 | HVAC | Stockton · San Joaquin County | — | — |
| A C Services | Alberth Jhony Melgar Melgar | — | (209) 321 0428 | HVAC | Tracy · San Joaquin County | — | — |
| A M S Heating INC | Arthur Dean Sanders | — | (209) 466 6692 | HVAC | Stockton · San Joaquin County | — | — |
| Aa Pro Heating & Cooling INC | Antonio Renteria | — | (209) 670 5802 | HVAC | Stockton · San Joaquin County | — | — |
| Accuflow Plumbing INC | Mike Martin | — | (209) 330 3569 | HVAC | Acampo · San Joaquin County | — | — |
| Adam Scott Ragsdale | Adam Scott Ragsdale | — | (209) 633 6332 | HVAC | Escalon · San Joaquin County | — | — |
| Adonai Heating & Air Conditioning | Adonai Heating & Air Conditioning | — | (209) 898 6567 | HVAC | Stockton · San Joaquin County | — | — |
| Advanced Tech 209 INC | Hassem Mohammad Samara | — | (209) 888 4944 | HVAC | Stockton · San Joaquin County | — | — |
| Affordable Heating & Air INC | Joseph Venanzio Bertolucci | — | (916) 922 2775 | HVAC | Lodi · San Joaquin County | — | — |
| Air Bros Mechanical LLC | Samuel Ibarra Jr Barajas | — | (209) 277 1877 | HVAC | Stockton · San Joaquin County | — | — |
| Air Care Pro | Air Care Pro | — | (209) 561 6089 | HVAC | Stockton · San Joaquin County | — | — |
| Air Care Solutions INC | Oscar Fernando Rodriguez | — | (209) 996 3286 | HVAC | Stockton · San Joaquin County | — | — |
| Air Dynamics Heating And Cooling Services | Kyle Anthony Silveira | — | (209) 914 8654 | HVAC | Tracy · San Joaquin County | — | — |
| Air King INC | Solomon S Ajlouni | info@air-king.com | (209) 933 1903 | HVAC | Stockton · San Joaquin County | — | — |
| Air Plus Mechanical | Air Plus Mechanical | info@airplusmechanical.com | (209) 610 8528 | HVAC | Stockton · San Joaquin County | — | — |
| Air Pro Comfort Systems INC | Robert Raymond Ii Batch | — | (209) 200 7861 | HVAC | Lodi · San Joaquin County | — | — |
| Air Repair Castelanelli | Michael Lee Castelanelli | — | (209) 712 8270 | HVAC | Lodi · San Joaquin County | — | — |
| Air Squared Mechanical | Jay Donald Friesen | — | (209) 581 9600 | HVAC | Tracy · San Joaquin County | — | — |
| Air Squared Mechanical Service And Maintenance INC | Jay Donald Friesen | — | (209) 581 9600 | HVAC | Tracy · San Joaquin County | — | — |
| Airflo Energy Solutions | Airflo Energy Solutions | — | (661) 747 0711 | HVAC | Stockton · San Joaquin County | — | — |
| Airteks Mechanical Services | Jerome Bernard Iii Bohland | — | (510) 719 0621 | HVAC | Stockton · San Joaquin County | — | — |
| Airway Heating & Air Conditioning | Airway Heating & Air Conditioning | — | (209) 823 7469 | HVAC | Manteca · San Joaquin County | — | — |
| Akaal Refrigeration INC | Jaswinder Singh Binder | — | (510) 467 4244 | HVAC | Tracy · San Joaquin County | — | — |
| All Air Heating & Air Conditioning | Kevin William Gutierrez | — | (209) 368 4264 | HVAC | Lodi · San Joaquin County | — | — |
| All HVAC Systems LLC | Suarez Ernesto | allhvacsystemsllc@gmail.com | (209) 562-5940 | HVAC | Tracy · San Joaquin County | — | — |
| All Refrigeration Solutions | All Refrigeration Solutions | — | (209) 331 0211 | HVAC | Lodi · San Joaquin County | — | — |
| Alliance Heating & Air | Alliance Heating & Air | — | (209) 915 2676 | HVAC | Manteca · San Joaquin County | — | — |
| American Air INC | Michael Lee George | — | (209) 464 1310 | HVAC | French Camp · San Joaquin County | — | — |
| Amron Mechanical INC | Kamaljeet Singh Ghuman | — | (209) 740 0266 | HVAC | Manteca · San Joaquin County | — | — |
| Angkor Heating Air Conditioning & Refrigeration | Somath Po | — | (209) 639 6930 | HVAC | Stockton · San Joaquin County | — | — |
| Arnaiz Development Company INC | Howard David Arnaiz | — | (209) 931 9740 | HVAC | Stockton · San Joaquin County | — | — |
| Artisan Electrical & HVAC INC | Mark Duwayne Toothman | — | (510) 571 9300 | HVAC | Tracy · San Joaquin County | — | — |
| B & B Heating & Air Conditioning INC | Robert David Jr Queirolo | — | (209) 474 8100 | HVAC | Stockton · San Joaquin County | — | — |
| Baker's Heating And Air Conditioning INC | Kevin William Gutierrez | — | (209) 334 5338 | HVAC | Lodi · San Joaquin County | — | — |
| Barry Construction | Robert Leo Barry | — | (209) 825 3900 | HVAC | Manteca · San Joaquin County | — | — |
| Basra Heating & Air Conditioning INC | Rajinder Singh Basra | — | (209) 834 6188 | HVAC | Tracy · San Joaquin County | — | — |