Best Licensed HVAC Contractors in San Mateo, CA
20 HVAC contractors registered in San Mateo hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by years licensed.
- 135 active C-20 heating and air conditioning licenses in San Mateo County; 20 registered in San Mateo
- California requires workers' compensation cover for C-20 licensees: 19 of San Mateo's 20 licenses (95.0%) carry a current policy with CSLB
- Median time licensed in San Mateo: 19 years
- Longest San Mateo licensure: since 1966
- 13 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1966
- Expires
- 2026-12-31
- Phone
- (650) 343-4542
- Verified
- August 17, 2026
- Licensed since
- 1972
- Expires
- 2027-04-30
- Phone
- (650) 342-3200
- Verified
- August 17, 2026
- Licensed since
- 1975
- Expires
- 2027-11-30
- Phone
- (650) 345-1691
- Verified
- August 17, 2026
- Licensed since
- 1983
- Expires
- 2027-01-31
- Phone
- (650) 302-9307
- Verified
- August 17, 2026
- Licensed since
- 1989
- Expires
- 2027-11-30
- Phone
- (650) 299-9070
- Verified
- August 17, 2026
- Licensed since
- 2001
- Expires
- 2027-05-31
- Phone
- (650) 571-6236
- Verified
- August 17, 2026
- Licensed since
- 2001
- Expires
- 2027-11-30
- Phone
- (650) 678-0405
- Verified
- August 17, 2026
- Licensed since
- 2002
- Expires
- 2027-10-31
- Phone
- (650) 619-4150
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Lindstrom Co | #244500 | On file | 1966 |
| Izmirian Roofing & Sheet Metal | #277624 | On file | 1972 |
| J W Mcclenahan Co | #308818 | On file | 1975 |
| Richards Hvac | #433455 | On file | 1983 |
| Cp Mechanical | #558197 | On file | 1989 |
| Ace Heating & Air Conditioning Inc. | #794984 | Exempt or none on file | 2001 |
San Mateo County HVAC licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 135 active C-20 heating and air conditioning licenses in San Mateo County, 20 of them registered in San Mateo. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median San Mateo license has been held 19 years, and the longest-standing one dates to 1966. 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: 19 of San Mateo's 20 licenses (95.0%) carry a current policy in CSLB's file, and we do not rank on it. The contractor bond is not a signal here: 135 of the county's 135 licenses carry the same $25,000 bond California sets by statute. 13 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 San Mateo: common questions
How many licensed HVAC contractors are there in San Mateo?
20 active C-20 heating and air conditioning licenses are registered in San Mateo, out of 135 across San Mateo County. 20 San Mateo-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. 20 active C-20 heating and air conditioning licenses are registered in San Mateo and 135 across San Mateo County, the longest-standing issued in 1966. 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 19 of San Mateo's 20 currently carry. 13 San Mateo County licenses expire within 90 days.