Best Licensed HVAC Contractors in Fremont, CA
24 HVAC contractors registered in Fremont hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by years licensed.
- 273 active C-20 heating and air conditioning licenses in Alameda County; 24 registered in Fremont
- California requires workers' compensation cover for C-20 licensees: 24 of Fremont's 24 licenses (100.0%) carry a current policy with CSLB
- Median time licensed in Fremont: 11 years
- Longest Fremont licensure: since 1987
- 20 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1987
- Expires
- 2027-05-31
- Phone
- (510) 490-5655
- Verified
- August 17, 2026
- Licensed since
- 1989
- Expires
- 2027-04-30
- Phone
- (408) 210-5277
- Verified
- August 17, 2026
- Licensed since
- 1991
- Expires
- 2027-05-31
- Phone
- (510) 821-4162
- Verified
- August 17, 2026
- Licensed since
- 1996
- Expires
- 2028-05-31
- Phone
- (510) 715-8490
- Verified
- August 17, 2026
- Licensed since
- 1996
- Expires
- 2027-10-31
- Phone
- (510) 438-8806
- Verified
- August 17, 2026
- Licensed since
- 1998
- Expires
- 2028-01-31
- Phone
- (510) 377-1856
- Verified
- August 17, 2026
- Licensed since
- 1999
- Expires
- 2027-06-30
- Phone
- (650) 298-0577
- Verified
- August 17, 2026
- Licensed since
- 2001
- Expires
- 2028-06-30
- Phone
- (877) 359-1758
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Alton Air Conditioning & Heating Inc. | #511296 | On file | 1987 |
| A H Construction | #566329 | On file | 1989 |
| R J Heating & Air Conditioning | #619678 | On file | 1991 |
| Aircal Heating | #723257 | On file | 1996 |
| R C's Mechanical Services | #724430 | On file | 1996 |
| J F K Builders | #744983 | On file | 1998 |
Alameda County HVAC licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 273 active C-20 heating and air conditioning licenses in Alameda County, 24 of them registered in Fremont. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Fremont license has been held 11 years, and the longest-standing one dates to 1987. 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: 24 of Fremont's 24 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: 273 of the county's 273 licenses carry the same $25,000 bond California sets by statute. 20 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 Fremont: common questions
How many licensed HVAC contractors are there in Fremont?
24 active C-20 heating and air conditioning licenses are registered in Fremont, out of 273 across Alameda County. 24 Fremont-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. 24 active C-20 heating and air conditioning licenses are registered in Fremont and 273 across Alameda County, the longest-standing issued in 1987. 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 24 of Fremont's 24 currently carry. 20 Alameda County licenses expire within 90 days.