California › Contra Costa County › HVAC › Danville
Licensed HVAC contractors in Danville
15 contractors with a Danville mailing address hold an active (CLEAR) CSLB C-20 Warm-Air Heating, Ventilating and Air-Conditioning (HVAC) license in CSLB's license file dated Oct 20, 2026. 15 of them show a workers' comp policy on file. Get quotes from up to 3 of them →
Heating and air conditioning work calls for a C-20 license. CSLB requires C-20 licensees to carry workers' compensation even if they have no employees, so check that a policy is on file.
FeaturedAds · paid placement
Ad space · openAdvertise here
A Featured spot on this hvac page for Danville is a paid ad for a License Verified contractor, labeled "Ad" every time. It sits apart from the directory and never changes the order below. From $49/mo. Join the waitlist →
Ad space · openAdvertise here
A Featured spot on this hvac page for Danville is a paid ad for a License Verified contractor, labeled "Ad" every time. It sits apart from the directory and never changes the order below. From $49/mo. Join the waitlist →
All 15 licensed HVAC contractors
Order: A–Z by business name (neutral, stated). Showing 1–15. ABRAHAM K ALVAREZ
C-20 · also B · Lic. #1116811 · Danville 94526
Workers' comp policy on file
Active — CSLB flag: bond payment pending (entity)
AIR DESIGN HEATING & COOLING
C-20 · also C-43 · Lic. #604264 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ASCENT CONSERVE INC
C-20 · Lic. #1147057 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ASCENT INC
C-20 · Lic. #1069809 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
BOSCOLAI CONSTRUCTION
C-20 · also A, B, C-10, C-16… · Lic. #1120060 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
CALIFORNIA AIR INC
C-20 · also C-43 · Lic. #300798 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
CAW AIR CONSTRUCTION INC
C-20 · also B · Lic. #1152720 · Danville 94506
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
H C JENSEN PLUMBING INC
C-20 · also C-36, C-43 · Lic. #265318 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
HVAC ENERGY SOLUTIONS
C-20 · Lic. #1132058 · Danville 94526
Workers' comp policy on file
Active — CSLB flag: workers' comp suspension pending
M-23 MECHANICAL SYSTEMS
C-20 · Lic. #1083192 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
MATHENEYS PLUMBING & HEATING
C-20 · also C-36, C-42 · Lic. #933520 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
OLSSON PLUMBING COMPANY
C-20 · also C-4, C-36, C-42, C-43 · Lic. #443706 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
QUALTECH HEATING & COOLING
C-20 · Lic. #905205 · Danville 94506
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
R & J CONSTRUCTION INC
C-20 · also B · Lic. #539313 · Danville 94506
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
S & H CONSTRUCTION INC
C-20 · also A, B, C-9, C-10… · Lic. #786358 · Danville 94526
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026