Best Licensed HVAC Contractors in Walnut Creek, CA
13 HVAC contractors registered in Walnut Creek 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; 13 registered in Walnut Creek
- California requires workers' compensation cover for C-20 licensees: 13 of Walnut Creek's 13 licenses (100.0%) carry a current policy with CSLB
- Median time licensed in Walnut Creek: 19 years
- Longest Walnut Creek licensure: since 1976
- 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
- 1976
- Expires
- 2026-12-31
- Phone
- (925) 525-9055
- Verified
- August 17, 2026
- Licensed since
- 1987
- Expires
- 2027-10-31
- Phone
- (925) 212-3470
- Verified
- August 17, 2026
- Licensed since
- 1992
- Expires
- 2028-07-31
- Phone
- (925) 279-3330
- Verified
- August 17, 2026
- Licensed since
- 1995
- Expires
- 2027-05-31
- Phone
- (925) 453-1315
- Verified
- August 17, 2026
- Licensed since
- 2002
- Expires
- 2028-03-31
- Phone
- (925) 288-9223
- Verified
- August 17, 2026
- Licensed since
- 2003
- Expires
- 2027-09-30
- Phone
- (925) 979-1300
- Verified
- August 17, 2026
- Licensed since
- 2006
- Expires
- 2028-08-31
- Phone
- (925) 946-9101
- Verified
- August 17, 2026
- Licensed since
- 2010
- Expires
- 2028-03-31
- Phone
- (925) 363-4498
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Hearthstone Building & Restoration | #319036 | On file | 1976 |
| Freeman's Heating Air Conditioning & Electrical Services | #519835 | On file | 1987 |
| Air - Con Mechanical Services Inc. | #636428 | On file | 1992 |
| Grace Heating And Air Inc. | #705148 | On file | 1995 |
| All Bay Heating Air Conditioning & Construction Inc. | #805473 | On file | 2002 |
| Diablo Thermal Systems Inc. | #823200 | On file | 2003 |
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, 13 of them registered in Walnut Creek. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Walnut Creek license has been held 19 years, and the longest-standing one dates to 1976. 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: 13 of Walnut Creek's 13 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 Walnut Creek: common questions
How many licensed HVAC contractors are there in Walnut Creek?
13 active C-20 heating and air conditioning licenses are registered in Walnut Creek, out of 317 across Contra Costa County. 13 Walnut Creek-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. 13 active C-20 heating and air conditioning licenses are registered in Walnut Creek and 317 across Contra Costa County, the longest-standing issued in 1976. 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 13 of Walnut Creek's 13 currently carry. 28 Contra Costa County licenses expire within 90 days.