HVAC contractor (C-20) in Ontario, CA
13 licenses · checked Oct 27, 2026
There are 13 HVAC contractor (C-20) licenses with an address of record in Ontario, CA, in the CSLB License Master data checked Oct 27, 2026. That is 0.7% of the 1,847 such licenses statewide; Ontario ranks #23 of 425 CA cities for this license type. They are spread across 3 ZIP codes; the most common are 91761 (7), 91762 (4), 91764 (2). Most list San Bernardino County. By business type: Corporation 7, Sole Owner 4, Limited Liability 2. The median first-issue year is 2018; the oldest license dates from 2015. 6 of them come up for renewal or expiration in the next 12 months, so re-check status before you sign a contract.
What a HVAC contractor (C-20) license covers
Warm-Air Heating, Ventilating and Air-Conditioning (C-20) covers furnaces, heat pumps, air-conditioning units, ducts and ventilation systems.
How to verify a license
Enter the license number in CSLB Instant License Check and confirm the status is active, the classification matches the work, and the contractor has a current bond and workers' compensation coverage (or a valid exemption). California requires the license number on contracts and advertising. Official lookup: CSLB Instant License Check.
HVAC contractor (C-20) licenses in Ontario
Showing 13 of 13, A to Z. Listing order is alphabetical, not a recommendation.
- AA Hvac INC#1057513 · 91761
- AMJ Mechanical#1031031 · 91761
- Ansary Aboubakare#1042235 · 91761
- Chun LI#1054025 · 91761
- Custom Homes Contractor DBA Custom Homes Construction#1045173 · 91761
- Diamond AIR Services INC#1047483 · 91761
- High Speed Rooter AND Plumbing INC#1017796 · 91762
- Jason Jang#1035039 · 91764
- JN Construction INC#1001396 · 91762
- Just Temperature INC#1062818 · 91762
- Mechanical Control#1019123 · 91762
- Veltel Infrastructure Services LLC#1049531 · 91764
- Virtue AIR Conditioning INC#1053503 · 91761
Frequently asked questions
How many HVAC contractor (C-20) licenses are in Ontario?
13 active licenses in the CSLB License Master data checked Oct 27, 2026 (0.7% of CA).
What does a HVAC contractor (C-20) license cover?
Warm-Air Heating, Ventilating and Air-Conditioning (C-20) covers furnaces, heat pumps, air-conditioning units, ducts and ventilation systems.
How do I verify a HVAC contractor (C-20) license in Ontario?
Enter the license number in CSLB Instant License Check and confirm the status is active, the classification matches the work, and the contractor has a current bond and workers' compensation coverage (or a valid exemption). California requires the license number on contracts and advertising. Use the license number shown here with the CSLB Instant License Check.
How many Ontario HVAC contractor (C-20) licenses expire soon?
6 of 13 have an expiration date in the next 12 months. A license that lapses must be renewed before the holder can work under it again.
Other license types in Ontario
General building contractor (45) · Electrical contractor (C-10) (31) · General engineering contractor (16) · Painting contractor (C-33) (13) · Plumbing contractor (C-36) (10) · Low-voltage contractor (C-7) (9) · Landscaping contractor (C-27) (7) · Drywall contractor (C-9) (6) · Tile contractor (C-54) (4) · Cabinet and finish carpentry contractor (C-6) (4) · Flooring contractor (C-15) (3) · Concrete contractor (C-8) (3)
All HVAC contractor (C-20) licenses in CA →
Source: CSLB License Master. Licensed California is independent and not affiliated with the licensing agency. Data checked Oct 27, 2026.