Best Licensed HVAC Contractors in Livermore, CA
52 HVAC contractors registered in Livermore 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; 53 registered in Livermore
- California requires workers' compensation cover for C-20 licensees: 52 of Livermore's 53 licenses (98.1%) carry a current policy with CSLB
- Median time licensed in Livermore: 17 years
- Longest Livermore licensure: since 1968
- 20 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1968
- Expires
- 2028-02-29
- Phone
- (925) 447-3000
- Verified
- August 17, 2026
- Licensed since
- 1977
- Expires
- 2027-04-30
- Phone
- (925) 371-2665
- Verified
- August 17, 2026
- Licensed since
- 1980
- Expires
- 2028-06-30
- Phone
- (925) 449-4354
- Verified
- August 17, 2026
- Licensed since
- 1981
- Expires
- 2027-12-31
- Phone
- (510) 614-3500
- Verified
- August 17, 2026
- Licensed since
- 1986
- Expires
- 2028-06-30
- Phone
- (925) 456-8880
- Verified
- August 17, 2026
- Licensed since
- 1989
- Expires
- 2027-01-31
- Phone
- (650) 592-7955
- Verified
- August 17, 2026
- Licensed since
- 1990
- Expires
- 2026-11-30
- Phone
- (925) 455-0720
- Verified
- August 17, 2026
- Licensed since
- 1991
- Expires
- 2027-09-30
- Phone
- (925) 454-1259
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Miller's Air Conditioning & Heating | #253756 | On file | 1968 |
| Ok Heating And Air Conditioning Inc. | #332447 | On file | 1977 |
| J D General Construction Inc. | #391749 | On file | 1980 |
| Marina Mechanical Services | #416198 | On file | 1981 |
| Delcon Heating And Air Conditioning | #493271 | On file | 1986 |
| Alpine Mechanical Service Company Inc. | #553780 | On file | 1989 |
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, 53 of them registered in Livermore. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Livermore license has been held 17 years, and the longest-standing one dates to 1968. 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: 52 of Livermore's 53 licenses (98.1%) 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 Livermore: common questions
How many licensed HVAC contractors are there in Livermore?
53 active C-20 heating and air conditioning licenses are registered in Livermore, out of 273 across Alameda County. 52 Livermore-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. 53 active C-20 heating and air conditioning licenses are registered in Livermore and 273 across Alameda County, the longest-standing issued in 1968. 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 52 of Livermore's 53 currently carry. 20 Alameda County licenses expire within 90 days.