Licensed Heating & Air Conditioning (C-20) contractors in Diamond Bar, CA

The California Contractors State License Board (CSLB) lists 24 Heating & Air Conditioning (C-20) contractors in Diamond Bar, California. Each links to a full dossier with license status, insurance, bond, and enforcement — as of October 6, 2026.

24 contractors

1. Ace Rodil Heating And Air Conditioning

   Diamond Bar, CA · CSLB #631042 · as of October 6, 2026
   Active · clear
2. Ac Heat Diamond Bar

   Diamond Bar, CA · CSLB #1145762 · as of October 6, 2026
   Active · clear
3. Allwayz Heating & Air Conditioning INC

   Diamond Bar, CA · CSLB #1097372 · as of October 6, 2026
   Active · clear
4. Atlantic Air Conditioning INC

   Diamond Bar, CA · CSLB #613226 · as of October 6, 2026
   Active · clear
5. Climate Specialists

   Diamond Bar, CA · CSLB #1003654 · as of October 6, 2026
   Active · clear
6. Kenneth Daley Heating & Air Services

   Diamond Bar, CA · CSLB #798187 · as of October 6, 2026
   Active · clear
7. Four Seasons Air Conditioning And Heating

   Diamond Bar, CA · CSLB #966880 · as of October 6, 2026
   Active · clear
8. Green Air & Refrigeration

   Diamond Bar, CA · CSLB #839148 · as of October 6, 2026
   Active · clear
9. High Noon Air

   Diamond Bar, CA · CSLB #1085441 · as of October 6, 2026
   Active · clear
10. Honest Pro Air Conditioning And Heating

    Diamond Bar, CA · CSLB #1106190 · as of October 6, 2026
    Active · clear
11. Lanyi USA INC

    Diamond Bar, CA · CSLB #1121762 · as of October 6, 2026
    Active · clear
12. L B Air Conditioning

    Diamond Bar, CA · CSLB #1072480 · as of October 6, 2026
    Active · clear
13. Likai Chen HVAC INC

    Diamond Bar, CA · CSLB #926434 · as of October 6, 2026
    Active · clear
14. Mac Refrigeration And Air Conditioning CO

    Diamond Bar, CA · CSLB #580557 · as of October 6, 2026
    Active · clear
15. Mcmaster Mechanical

    Diamond Bar, CA · CSLB #879152 · as of October 6, 2026
    Active · clear
16. MR A/c

    Diamond Bar, CA · CSLB #864636 · as of October 6, 2026
    Active · clear
17. Plhk HVAC INC

    Diamond Bar, CA · CSLB #1151997 · as of October 6, 2026
    Active · clear
18. Service Wizards

    Diamond Bar, CA · CSLB #797071 · as of October 6, 2026
    Active · clear
19. Chung Chieh Wu

    Diamond Bar, CA · CSLB #1105504 · as of October 6, 2026
    Active · clear
20. YQ Air Condition Solution

    Diamond Bar, CA · CSLB #1077548 · as of October 6, 2026
    Active · clear
21. Yuze Air Conditioning

    Diamond Bar, CA · CSLB #1086305 · as of October 6, 2026
    Active · clear
22. ZY HVAC Equipment Services

    Diamond Bar, CA · CSLB #1133374 · as of October 6, 2026
    Active · clear
23. Gary's Ac Services

    Diamond Bar, CA · CSLB #921063 · as of October 6, 2026
    Suspended · bond
24. Medrara HVAC

    Diamond Bar, CA · CSLB #1042958 · as of October 6, 2026
    Suspended · bond

See all Heating & Air Conditioning (C-20) contractors in California →

Data sourced from the California Contractors State License Board (CSLB), current as of October 6, 2026. IsItLicensed is not affiliated with or endorsed by the CSLB or the State of California. Always verify against the official record.