Best Licensed HVAC Contractors in South San Francisco, CA
16 HVAC contractors registered in South San Francisco hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by years licensed.
- 135 active C-20 heating and air conditioning licenses in San Mateo County; 17 registered in South San Francisco
- California requires workers' compensation cover for C-20 licensees: 17 of South San Francisco's 17 licenses (100.0%) carry a current policy with CSLB
- Median time licensed in South San Francisco: 21 years
- Longest South San Francisco licensure: since 1965
- 13 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1965
- Expires
- 2027-09-30
- Phone
- (415) 661-8000
- Verified
- August 17, 2026
- Licensed since
- 1990
- Expires
- 2028-01-31
- Phone
- (650) 742-9640
- Verified
- August 17, 2026
- Licensed since
- 1990
- Expires
- 2028-04-30
- Phone
- (650) 876-1801
- Verified
- August 17, 2026
- Licensed since
- 1997
- Expires
- 2027-05-31
- Phone
- (650) 552-9885
- Verified
- August 17, 2026
- Licensed since
- 1999
- Expires
- 2027-03-31
- Phone
- (415) 584-2743
- Verified
- August 17, 2026
- Licensed since
- 2002
- Expires
- 2028-07-31
- Phone
- (415) 710-8777
- Verified
- August 17, 2026
- Licensed since
- 2004
- Expires
- 2028-01-31
- Phone
- (650) 583-6200
- Verified
- August 17, 2026
- Licensed since
- 2004
- Expires
- 2026-12-31
- Phone
- (650) 615-0248
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Ace Furnace Company Inc. | #235989 | On file | 1965 |
| Brady Air Service Inc. | #585882 | On file | 1990 |
| Hargens Inc. | #592325 | On file | 1990 |
| Annuzzi Heating And Cooling Inc. | #742916 | On file | 1997 |
| Wolves Hvac Mechanical | #760264 | On file | 1999 |
| Chen's Construction And Mechanical Inc. | #814802 | On file | 2002 |
San Mateo County HVAC licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 135 active C-20 heating and air conditioning licenses in San Mateo County, 17 of them registered in South San Francisco. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median South San Francisco license has been held 21 years, and the longest-standing one dates to 1965. California law requires workers' compensation cover for C-20 licensees, so it is a legal baseline rather than a way to tell two contractors apart: 17 of South San Francisco's 17 licenses (100.0%) carry a current policy in CSLB's file, and we do not rank on it. The contractor bond is not a signal here: 135 of the county's 135 licenses carry the same $25,000 bond California sets by statute. 13 county licenses reach their expiration date within the next 90 days. CSLB cannot link straight to a license record, so every listing above shows its number for you to type into CSLB's license lookup. How we verify.
HVAC Contractors in South San Francisco: common questions
How many licensed HVAC contractors are there in South San Francisco?
17 active C-20 heating and air conditioning licenses are registered in South San Francisco, out of 135 across San Mateo County. 16 South San Francisco-registered companies passed our license verification, and the 8 on this page are the top-ranked of those. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license HVAC contractors?
Yes. California licenses contractors by classification, and C-20 is the CSLB classification that authorises this work. 17 active C-20 heating and air conditioning licenses are registered in South San Francisco and 135 across San Mateo County, the longest-standing issued in 1965. Only CLEAR, unexpired licenses appear here.
How do I check an HVAC contractor's license in California?
Every listing above shows its CSLB license number. CSLB cannot link straight to a record, so open its license lookup and type the number in: it shows status, expiration, the contractor bond and workers' compensation cover, which California requires of C-20 licensees and 17 of South San Francisco's 17 currently carry. 13 San Mateo County licenses expire within 90 days.