Best Licensed HVAC Contractors in Danville, CA
14 HVAC contractors registered in Danville hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by years licensed.
- 317 active C-20 heating and air conditioning licenses in Contra Costa County; 14 registered in Danville
- California requires workers' compensation cover for C-20 licensees: 14 of Danville's 14 licenses (100.0%) carry a current policy with CSLB
- Median time licensed in Danville: 17 years
- Longest Danville licensure: since 1970
- 28 county licenses reach their expiration date within 90 days
We earn a fee when you call businesses through numbers on this site. This never affects who is listed or how they rank.
- Verified
- August 17, 2026
- Licensed since
- 1970
- Expires
- 2028-04-30
- Phone
- (925) 837-4450
- Verified
- August 17, 2026
- Licensed since
- 1974
- Expires
- 2028-06-30
- Phone
- (925) 248-8117
- Verified
- August 17, 2026
- Licensed since
- 1983
- Expires
- 2028-07-31
- Phone
- (510) 522-2442
- Verified
- August 17, 2026
- Licensed since
- 1988
- Expires
- 2028-08-31
- Phone
- (925) 648-7942
- Verified
- August 17, 2026
- Licensed since
- 1990
- Expires
- 2026-10-31
- Phone
- (925) 837-4328
- Verified
- August 17, 2026
- Licensed since
- 2000
- Expires
- 2028-06-30
- Phone
- (510) 579-7382
- Verified
- August 17, 2026
- Licensed since
- 2007
- Expires
- 2027-10-31
- Phone
- (925) 831-2444
- Verified
- August 17, 2026
- Licensed since
- 2009
- Expires
- 2027-06-30
- Phone
- (925) 362-9814
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| H C Jensen Plumbing Inc. | #265318 | On file | 1970 |
| California Air Inc. | #300798 | On file | 1974 |
| Olsson Plumbing Company | #443706 | On file | 1983 |
| R & J Construction Inc. | #539313 | On file | 1988 |
| Air Design Heating & Cooling | #604264 | On file | 1990 |
| S & H Construction Inc. | #786358 | On file | 2000 |
Contra Costa County HVAC licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 317 active C-20 heating and air conditioning licenses in Contra Costa County, 14 of them registered in Danville. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Danville license has been held 17 years, and the longest-standing one dates to 1970. 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: 14 of Danville's 14 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: 317 of the county's 317 licenses carry the same $25,000 bond California sets by statute. 28 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 Danville: common questions
How many licensed HVAC contractors are there in Danville?
14 active C-20 heating and air conditioning licenses are registered in Danville, out of 317 across Contra Costa County. 14 Danville-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. 14 active C-20 heating and air conditioning licenses are registered in Danville and 317 across Contra Costa County, the longest-standing issued in 1970. 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 14 of Danville's 14 currently carry. 28 Contra Costa County licenses expire within 90 days.