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Licensed HVAC contractors in Castro Valley
10 contractors with a Castro Valley mailing address hold an active (CLEAR) CSLB C-20 Warm-Air Heating, Ventilating and Air-Conditioning (HVAC) license in CSLB's license file dated Oct 20, 2026. 9 of them show a workers' comp policy on file. Get quotes from up to 3 of them →
Heating and air conditioning work calls for a C-20 license. CSLB requires C-20 licensees to carry workers' compensation even if they have no employees, so check that a policy is on file.
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Ad space · openAdvertise here
A Featured spot on this hvac page for Castro Valley is a paid ad for a License Verified contractor, labeled "Ad" every time. It sits apart from the directory and never changes the order below. From $49/mo. Join the waitlist →
All 10 licensed HVAC contractors
Order: A–Z by business name (neutral, stated). Showing 1–10. 4-SEASONS HEATING & AIR CONDITIONING
C-20 · Lic. #962971 · Castro Valley 94546
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AFFORDABLE HEATING AND AIR CONDITIONING
C-20 · Lic. #909632 · Castro Valley 94546
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
B A MORRISON
C-20 · also B · Lic. #603913 · Castro Valley 94546
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
CHENG'S MECHANICAL CONTRACTOR
C-20 · Lic. #1036153 · Castro Valley 94546
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
FRANK BONETTI PLUMBING INC
C-20 · also C-4, C-34, C-36, C-42 · Lic. #251165 · Castro Valley 94546
Workers' comp: via leasing/temp firm
✓License Verified CSLB file · Oct 20, 2026
M1 MECHANICAL CORP
C-20 · Lic. #1129897 · Castro Valley 94546
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
SIGMA HVAC & ELECTRIC INC
C-20 · also B, C-10 · Lic. #1128583 · Castro Valley 94546
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
SPECIALIZED HEATING & AIR CONDITIONING
C-20 · Lic. #741785 · Castro Valley 94552
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
TRITON HVAC & APPLIANCE REPAIR
C-20 · Lic. #1138925 · Castro Valley 94546
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
VARIOUS ENERGY
C-20 · also A, B, C-10 · Lic. #1145723 · Castro Valley 94546
Workers' comp policy on file
Active — CSLB flag: disciplinary bond filed