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Licensed HVAC contractors in Ontario
51 contractors with a Ontario 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. 49 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.
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A Featured spot on this hvac page for Ontario 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 51 licensed HVAC contractors
Order: A–Z by business name (neutral, stated). Showing 1–51. A G HEATING & AIR
C-20 · Lic. #1132532 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AA HVAC INC
C-20 · Lic. #1057513 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ADAPTIVE CONTROLS SERVICES
C-20 · Lic. #1116142 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AIR BEE HVAC
C-20 · Lic. #1158451 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AIR CONTROL SPECIALTIES INC
C-20 · Lic. #570881 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AIR CONTROL SYSTEMS INC
C-20 · also C-2 · Lic. #639003 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AIRITE HEATING AND AIR CONDITIONING INC
C-20 · also C-4, C-38 · Lic. #232930 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AIRTONG HEATING & COOLING
C-20 · Lic. #991016 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ALL PRO COOLING HEATING PLUMBING & ELECTRICAL
C-20 · also C-10, C-36 · Lic. #1103983 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
AMJ MECHANICAL
C-20 · also C-10, D-35 · Lic. #1031031 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ANSARY ABOUBAKARE
C-20 · also B, C-38 · Lic. #1042235 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
BRIAN YAWCHING KAO
C-20 · also B, C-10, C-36 · Lic. #897876 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
CHUN LI
C-20 · Lic. #1054025 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
CUSTOM HOMES CONTRACTOR DBA CUSTOM HOMES CONSTRUCTION
C-20 · also B, C-38 · Lic. #1045173 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
DAO LE
C-20 · Lic. #864673 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
DIAMOND AIR SERVICES INC
C-20 · also B, C-43 · Lic. #1047483 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
DS HVAC INC
C-20 · Lic. #1132699 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
DSS HIGH PERFORMANCE HVAC SOLUTIONS
C-20 · Lic. #1158389 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
EFFINA
C-20 · Lic. #1150901 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ELITE PRECISION AIR SYSTEMS
C-20 · Lic. #1139417 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ERWIN ADVANCED AIR SYSTEMS
C-20 · Lic. #897796 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
FOOTHILL HEATING & AIR CONDITIONING
C-20 · Lic. #979917 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
GET IT REPAIRED HEATING AND AIR INC
C-20 · Lic. #1155418 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
HIGH SPEED ROOTER AND PLUMBING INC
C-20 · also A, C-10, C-36, C-42 · Lic. #1017796 · Ontario 91762
Workers' comp: via leasing/temp firm
✓License Verified CSLB file · Oct 20, 2026
INTER-CITY ENERGY SYSTEMS INC
C-20 · also B, C-10, C-36 · Lic. #587709 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
JASON JANG
C-20 · Lic. #1035039 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
JESSE'S AIR SYSTEMS A / C & HEATING
C-20 · Lic. #864645 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
JN CONSTRUCTION INC
C-20 · also A, B, C-10, C-16… · Lic. #1001396 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
JULAN HAO
C-20 · also B · Lic. #1083815 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
JULIO ANTONIO CASTILLO
C-20 · also C-10 · Lic. #844311 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
JUST EVERYTHING HEATING & AIR INC
C-20 · Lic. #892799 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
JUST TEMPERATURE INC
C-20 · Lic. #1062818 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
MAGNISON AND MOEN INC
C-20 · Lic. #264898 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
MARCOS AIR CONDITIONING
C-20 · Lic. #950285 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
MASTER CHILL HEATING AND AIR
C-20 · Lic. #1138989 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
MECHANICAL CONTROL
C-20 · Lic. #1019123 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
MYCO CONSTRUCTION
C-20 · also B, C-17, C-27, C-33… · Lic. #853581 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
NICK AIR CONDITIONING INC
C-20 · Lic. #1135910 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
NORTHSTAR PHAC INC
C-20 · also C-36 · Lic. #916254 · Ontario 91761
Workers' comp: via leasing/temp firm
✓License Verified CSLB file · Oct 20, 2026
NORTON GENERAL CONTRACTORS
C-20 · also B, C-10 · Lic. #909595 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
ONTARIO REFRIGERATION COMMERCIAL AIR CONDITIONING HEATING & CONTR
C-20 · also C-38 · Lic. #315638 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
PHILLIP PARK
C-20 · Lic. #1102884 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
PISCES PLUMBING
C-20 · also C-36 · Lic. #1133446 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
RELIANT COOLING AND POWER LLC
C-20 · Lic. #1156506 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
SPEC CONSTRUCTION CO INC
C-20 · also A, B, C-4, C-8… · Lic. #419626 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
SPECIALIZED DAIRY SERVICE INC
C-20 · also C-10, C-38 · Lic. #875409 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
TECHNICOOL REFRIGERATION
C-20 · also C-38 · Lic. #987769 · Ontario 91762
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
THE CLIMATE CONTROLLERS A PARTNERSHIP
C-20 · Lic. #953750 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
VELTEL INFRASTRUCTURE SERVICES LLC
C-20 · also B, C-10 · Lic. #1049531 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
VIRTUE AIR CONDITIONING INC
C-20 · Lic. #1053503 · Ontario 91761
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026
WEST END HEATING AND AIR
C-20 · Lic. #1110549 · Ontario 91764
Workers' comp policy on file
✓License Verified CSLB file · Oct 20, 2026