California › Los Angeles County › HVAC › Altadena
Licensed HVAC contractors in Altadena
9 contractors with a Altadena 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 Altadena 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 9 licensed HVAC contractorsOrder: A–Z by business name (neutral, stated). Showing 1–9.
ACTION DUCT CLEANING COMPANY INC
C-20 · also B, C-43, D-62, D-64 · Lic. #570541 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AIR CONDITIONING SOLUTIONS INC
C-20 · also B, C-4, C-36, C-38 · Lic. #863580 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
COMFORT HEATING & COOLING SYSTEMS
C-20 · Lic. #707692 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
GRUETER CONSTRUCTION CORP
C-20 · also B, C-6 · Lic. #416414 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
H & H MECHANICAL INC
C-20 · also C-4 · Lic. #644029 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
MICHAEL D HOWE
C-20 · also C-10 · Lic. #522867 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
PRIME AIR MECHANICAL INC
C-20 · Lic. #1112002 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
SIMCO MECHANICAL INC
C-20 · also B, C-36 · Lic. #974288 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
SMALLING MECHANICAL CO
C-20 · also B · Lic. #956042 · Altadena 91001
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026