Best Licensed HVAC Contractors in Alameda, CA
5 HVAC contractors registered in Alameda hold current CSLB licenses, verified against official records as of August 17, 2026. All 5 are listed below, ordered by years licensed.
- 273 active C-20 heating and air conditioning licenses in Alameda County; 7 registered in Alameda
- California requires workers' compensation cover for C-20 licensees: 4 of Alameda's 7 licenses (57.1%) carry a current policy with CSLB
- Median time licensed in Alameda: 4 years
- Longest Alameda licensure: since 1989
- 20 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1989
- Expires
- 2026-12-31
- Phone
- (510) 523-0628
- Verified
- August 17, 2026
- Licensed since
- 2007
- Expires
- 2028-08-31
- Phone
- (510) 710-5571
- Verified
- August 17, 2026
- Licensed since
- 2007
- Expires
- 2027-08-31
- Phone
- (510) 217-8980
- Verified
- August 17, 2026
- Licensed since
- 2021
- Expires
- 2027-01-31
- Phone
- (805) 543-4881
- Verified
- August 17, 2026
- Licensed since
- 2024
- Expires
- 2026-10-31
- Phone
- (510) 951-5852
Compare the top 5 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| A T Weber Plumbing & Mechanical Services Inc. | #562098 | On file | 1989 |
| Alameda Island Heating & Air Conditioning LLC | #889253 | On file | 2007 |
| Comfort Air Mechanical Systems Inc. | #901310 | On file | 2007 |
| Albert Nahman Plumbing Heating And Cooling | #1083634 | Exempt or none on file | 2021 |
| Corral Coolng And Heating | #1128499 | On file | 2024 |
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, 7 of them registered in Alameda. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Alameda license has been held 4 years, and the longest-standing one dates to 1989. 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: 4 of Alameda's 7 licenses (57.1%) 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 Alameda: common questions
How many licensed HVAC contractors are there in Alameda?
7 active C-20 heating and air conditioning licenses are registered in Alameda, out of 273 across Alameda County. 5 Alameda-registered companies passed our license verification, and all 5 are listed on this page. 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. 7 active C-20 heating and air conditioning licenses are registered in Alameda and 273 across Alameda County, the longest-standing issued in 1989. 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 4 of Alameda's 7 currently carry. 20 Alameda County licenses expire within 90 days.