HVAC contractor (C-20) in Oakland, CA
13 licenses · checked Oct 27, 2026
There are 13 HVAC contractor (C-20) licenses with an address of record in Oakland, CA, in the CSLB License Master data checked Oct 27, 2026. That is 0.7% of the 1,847 such licenses statewide; Oakland ranks #22 of 425 CA cities for this license type. They are spread across 7 ZIP codes; the most common are 94621 (5), 94603 (3), 94605 (1). Most list Alameda County. By business type: Corporation 6, Sole Owner 4, Limited Liability 2, JointVenture 1. The median first-issue year is 2017; the oldest license dates from 2016. 8 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 Oakland
Showing 13 of 13, A to Z. Listing order is alphabetical, not a recommendation.
- Advanced Refrigeration#1017769 · 94603
- Attic Pros INC#1022608 · 94603
- Care Heating & AIR Conditioning INC#1023652 · 94621
- Carter'S Heating & AIR#1013227 · 94605
- Daniel'S Heating & A/C#1059101 · 94621
- ECO Energy BAY Area#1025592 · 94610
- Elden Plumbing INC#1015348 · 94606
- Energreen Mechanical#1017148 · 94621
- Harry Clark Heating & AIR Conditioning INC#1056105 · 94611
- Hvac Oren Services LLC#1048662 · 94603
- International Energy Resources LLC DBA Ambient Experts Hvac#1049324 · 94621
- Johnson'S Insulation#1051108 · 94612
- Monterey AND MWH Constructors, A Joint Venture#1063926 · 94621
Frequently asked questions
How many HVAC contractor (C-20) licenses are in Oakland?
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 Oakland?
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 Oakland HVAC contractor (C-20) licenses expire soon?
8 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 Oakland
General building contractor (109) · Electrical contractor (C-10) (24) · Painting contractor (C-33) (22) · General engineering contractor (20) · Plumbing contractor (C-36) (18) · Landscaping contractor (C-27) (14) · Roofing contractor (C-39) (9) · Flooring contractor (C-15) (8) · Concrete contractor (C-8) (5) · Cabinet and finish carpentry contractor (C-6) (5) · Glazing contractor (C-17) (5) · Tile contractor (C-54) (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.