Licensed Heating & Air Conditioning (C-20) contractors in California

The California Contractors State License Board (CSLB) lists 8,995 California contractors classified C-20 (Heating & Air Conditioning (C-20)). Each entry below links to a full dossier with license status, insurance, bond, and enforcement — as of July 2, 2026.

Showing 6,001–6,060 of 8,995 contractors

1. Ocean Breeze HVAC LLC

   Canyon Country, CA · CSLB #1113832 · as of July 2, 2026
   Active · clear
2. Ocean N Sun Heating And Air

   Panorama City, CA · CSLB #1023724 · as of July 2, 2026
   Active · clear
3. Ocean Pacific Mechanical Heating And Air

   Vista, CA · CSLB #1065367 · as of July 2, 2026
   Active · clear
4. Ocean Park Mechanical INC

   Seattle, CA · CSLB #986064 · as of July 2, 2026
   Active · clear
5. Oceanside Mechanical

   Oceanside, CA · CSLB #753165 · as of July 2, 2026
   Active · clear
6. Oceanview Mechanical LLC

   Long Beach, CA · CSLB #1121952 · as of July 2, 2026
   Active · clear
7. Ocegueda Mechanical INC

   Manteca, CA · CSLB #1146224 · as of July 2, 2026
   Active · clear
8. Oc Excel

   Orange, CA · CSLB #1001574 · as of July 2, 2026
   Active · clear
9. Oc HVAC

   Costa Mesa, CA · CSLB #1153531 · as of July 2, 2026
   Active · clear
10. Dan O'connor Heating

    Bolinas, CA · CSLB #410324 · as of July 2, 2026
    Active · clear
11. Oc Smart Temp Service

    Aliso Viejo, CA · CSLB #1151021 · as of July 2, 2026
    Active · clear
12. Octavio's Heating And Air

    Reseda, CA · CSLB #823464 · as of July 2, 2026
    Active · clear
13. Odi Heating & Cooling Corp

    Chatsworth, CA · CSLB #1115200 · as of July 2, 2026
    Active · clear
14. O'donnell Heating & Air INC

    Quartz Hill, CA · CSLB #910978 · as of July 2, 2026
    Active · clear
15. M A Ogg Heating & Air Conditioning INC

    Montclair, CA · CSLB #489652 · as of July 2, 2026
    Active · clear
16. Ohjae Lee

    Anaheim, CA · CSLB #1109268 · as of July 2, 2026
    Active · clear
17. Oig HVAC Installation & Repair LLC

    Santa Clarita, CA · CSLB #1135610 · as of July 2, 2026
    Active · clear
18. O & J Appliance Repair INC

    North Hollywood, CA · CSLB #913341 · as of July 2, 2026
    Active · clear
19. O K Appliance

    Northridge, CA · CSLB #545110 · as of July 2, 2026
    Active · clear
20. Ok Heating And Air Conditioning INC

    Livermore, CA · CSLB #332447 · as of July 2, 2026
    Active · clear
21. Ok Mechanical Services INC

    San Jose, CA · CSLB #1143639 · as of July 2, 2026
    Active · clear
22. Old Bridge Heating And Cooling

    San Jose, CA · CSLB #917016 · as of July 2, 2026
    Active · clear
23. Old Redwood Heating And Cooling

    Windsor, CA · CSLB #1147019 · as of July 2, 2026
    Active · clear
24. Old Towne Plumbing

    Orange, CA · CSLB #1002282 · as of July 2, 2026
    Active · clear
25. Dmitriy Olevskiy

    West Hills, CA · CSLB #979336 · as of July 2, 2026
    Active · clear
26. Oliver Heating And Air

    San Lorenzo, CA · CSLB #915348 · as of July 2, 2026
    Active · clear
27. Oliver Mechanical INC

    Corona, CA · CSLB #1136586 · as of July 2, 2026
    Active · clear
28. Olson Air

    Apple Valley, CA · CSLB #1126350 · as of July 2, 2026
    Active · clear
29. Olvera Air Conditioning INC

    Calexico, CA · CSLB #1012518 · as of July 2, 2026
    Active · clear
30. Olympic Air Tech

    Cerritos, CA · CSLB #1014679 · as of July 2, 2026
    Active · clear
31. Olympic Heating And Air

    Oakland, CA · CSLB #918993 · as of July 2, 2026
    Active · clear
32. Oma Heating & Cooling

    Los Banos, CA · CSLB #1148934 · as of July 2, 2026
    Active · clear
33. O'mahony Air Conditioning And Heating INC

    Glendora, CA · CSLB #871945 · as of July 2, 2026
    Active · clear
34. Omar Lopez

    Whittier, CA · CSLB #1123749 · as of July 2, 2026
    Active · clear
35. Omega Air

    San Diego, CA · CSLB #1149953 · as of July 2, 2026
    Active · clear
36. Omega Appliance Heating & Air Conditioning

    Tarzana, CA · CSLB #855328 · as of July 2, 2026
    Active · clear
37. Omega Cooling & Heating

    Temecula, CA · CSLB #1091292 · as of July 2, 2026
    Active · clear
38. Omega Heating And Air

    Hemet, CA · CSLB #1051241 · as of July 2, 2026
    Active · clear
39. Om Heating & Air Conditioning INC

    Berkeley, CA · CSLB #919475 · as of July 2, 2026
    Active · clear
40. Omid Heating & Air Conditioning

    Penn Valley, CA · CSLB #1127721 · as of July 2, 2026
    Active · clear
41. Omid Marouf

    Sacramento, CA · CSLB #1141181 · as of July 2, 2026
    Active · clear
42. Omni Air HVAC LLC

    Orange, CA · CSLB #1071374 · as of July 2, 2026
    Active · clear
43. Omnigrade Tradeworks INC

    Chatsworth, CA · CSLB #1033422 · as of July 2, 2026
    Active · clear
44. Omni Heating And Air INC

    Wildomar, CA · CSLB #1050193 · as of July 2, 2026
    Active · clear
45. Omni Mechanical Solutions

    Livermore, CA · CSLB #1028951 · as of July 2, 2026
    Active · clear
46. Omnisense HVAC

    Huntington Beach, CA · CSLB #1141036 · as of July 2, 2026
    Active · clear
47. Omts Heating And Cooling

    Canyon Lake, CA · CSLB #1144745 · as of July 2, 2026
    Active · clear
48. On Call Air Conditioning And Heating Repair For Less

    Bakersfield, CA · CSLB #938060 · as of July 2, 2026
    Active · clear
49. On Call Heating And Cooling

    Glendale, CA · CSLB #996251 · as of July 2, 2026
    Active · clear
50. One2's H V A C

    Northridge, CA · CSLB #986912 · as of July 2, 2026
    Active · clear
51. A & C Incorporated DBA One Call Heating And Cooling

    Riverside, CA · CSLB #1103795 · as of July 2, 2026
    Active · clear
52. One Hour Heating & Air Conditioning

    San Diego, CA · CSLB #1107267 · as of July 2, 2026
    Active · clear
53. One Hour Heating & Air Conditioning

    Vallejo, CA · CSLB #1151576 · as of July 2, 2026
    Active · clear
54. One Hour Heating & Air Conditioning Of Elk Grove

    Elk Grove, CA · CSLB #1143074 · as of July 2, 2026
    Active · clear
55. One Hour Heating And Air Conditioning

    Fullerton, CA · CSLB #1136570 · as of July 2, 2026
    Active · clear
56. One Hour Heating And Air Conditioning

    Mission Viejo, CA · CSLB #1140696 · as of July 2, 2026
    Active · clear
57. One Hour Heating And Air Conditioning

    Orange, CA · CSLB #1139941 · as of July 2, 2026
    Active · clear
58. One Hour Heating And Air Conditioning Of Pleasant Hill

    Pleasant Hill, CA · CSLB #1138012 · as of July 2, 2026
    Active · clear
59. O'neill's Heating And Air Conditioning

    Bakersfield, CA · CSLB #630151 · as of July 2, 2026
    Active · clear
60. One Season Heating And Air Conditioning

    Irvine, CA · CSLB #1038022 · as of July 2, 2026
    Active · clear

Data sourced from the California Contractors State License Board (CSLB), current as of July 2, 2026. IsItLicensed is not affiliated with or endorsed by the CSLB or the State of California. Always verify against the official record.