California HVAC License Requirements

Official classification: C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor · Issued by the Contractors State License Board (CSLB).

❄️ HVACCA ✔ Verified 2026-09-30

In California, HVAC contractors must hold the C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor, issued by the Contractors State License Board (CSLB), and a $25,000 surety bond is required. Full requirements — experience, exams, fees, insurance, renewal and reciprocity — are detailed below.

How to become a licensed HVAC contractor in California

Follow these steps to earn your C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor. Every figure is verified against the Contractors State License Board (CSLB); full detail for each step is further down the page.

1. Build the required experience. 4 years of journey-level HVAC experience within the last 10 years. Up to 3 years may be credited for approved apprenticeship, technical training or education; at least 1 year must be practical experience.
2. Pass the Law & Business and C-20 Warm-Air HVAC Trade exams. Providers, passing scores and fees are in the Exams section below.
3. Secure your surety bond. California requires $25,000 contractor bond (since Jan 1, 2023). Additional $25,000 Bond of Qualifying Individual if qualified by an RME or by an RMO who owns less than 10% of the company.
4. Check the insurance rules. Liability: Not state-mandated, but commonly required by clients and general contractors. Workers' compensation: Required for ALL C-20 HVAC contractors even with no employees (B&P Code §7125). Like C-39 roofers, C-20 contractors cannot file a workers' comp exemption — coverage (or a Certification of Self-Insurance) must be maintained as a condition of licensure.
5. Clear the background check. Live Scan fingerprints; DOJ ($32) + FBI ($17) criminal background check. Convictions reviewed case-by-case for substantial relation to contractor duties.
6. Submit your application and fees. Apply through the Contractors State License Board (CSLB) — $450 (nonrefundable) application fee, plus a $200 (sole owner) / $350 (non-sole owner) license fee. Processing time: Variable; status checkable on the CSLB website.
7. Keep the license active. Renewal: Every 2 years.

For the general path in every state, see the HVAC guide →

California HVAC contractor license lookup

To confirm an HVAC contractor is properly licensed in California — or to check the status of your own license — search the issuing agency's official license database. The record shows whether the license is active and in good standing.

License types

• C-20 Warm-Air HVAC Contractor — Statewide license to fabricate, install, maintain and repair warm-air heating, ventilating and air-conditioning systems — including the ducts, registers, flues, humidity and thermostatic controls, and air filters connected with them, plus solar-energy systems used for these purposes.

Requirements at a glance

What a California hvac license costs

Exams

Renewing a California HVAC contractor license

The C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor renews on a fixed cycle set by the Contractors State License Board (CSLB). Late and lapsed renewals are handled differently by every board, so check the renewal page linked below before the deadline passes.

Frequently asked questions

Official sources

cslb.ca.gov/about_us/library/licensing_classifications/Licensing_Classifications_Detail.aspx?Class=C20
cslb.ca.gov/about_us/library/fees.aspx
cslb.ca.gov/contractors/maintain_license/bond_information/bond_requirements.aspx
cslb.ca.gov/Contractors/Maintain_License/Workers_Compensation.aspx

Other California contractor licenses

HVAC licensing in other states