HVAC License Requirements for California

If you’re looking to start or grow an HVAC business in California, getting licensed isn’t optional — it’s legally required. Whether you’re installing new systems, handling refrigerants, or servicing heating and cooling units, the state enforces clear rules to protect consumers and hold contractors accountable.

This guide walks you through exactly what you need to know to get licensed as an HVAC contractor in California.

Who Needs an HVAC License in California?

In California, anyone performing HVAC work valued at $500 or more in labor and materials must have a license issued by the Contractors State License Board (CSLB). This includes:

• Installing or repairing heating and cooling systems
• Handling refrigerants or ventilation systems
• Performing HVAC maintenance contracts over $500
• Managing HVAC projects as a contractor

Unlicensed work over $500 is illegal and can result in fines or criminal penalties.

Which License Do You Need?

HVAC professionals must obtain the C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor license.

This license allows you to:

• Install and maintain warm-air heating systems
• Install and service ventilation and ductwork
• Work on evaporative cooling and forced-air systems
• Handle thermostats, blowers, air ducts, and more

It does not authorize you to perform plumbing, electrical, or solar panel work unless you hold additional classifications.

How to Qualify for the C-20 License

To qualify for the C-20 license, you must:

1. Be at least 18 years old
2. Have a valid Social Security or ITIN number
3. Possess four years of journey-level experience in HVAC within the past 10 years. Up to three years of vocational training or apprenticeship credit can substitute, but at least one year must be field experience.
4. Pass two state exams (Trade + Law & Business)
5. Submit a full application to the CSLB
6. Undergo fingerprinting for a background check
7. Have a valid Workers’ Compensation policy (if you have employees)
8. Post a $25,000 contractor license bond, as required by CSLB for all active licenses as of 2023.

If you’re short on experience, you may still apply with a qualified person (like a Responsible Managing Employee or Officer) to represent your experience.

Required Exams

California requires two exams:

• Trade Exam (C-20): Covers HVAC theory, installation, maintenance, safety, codes, and troubleshooting.
• Law & Business Exam: Covers California contracting law, business operations, finances, and licensing rules.

Both exams are multiple-choice and computer-based. CSLB provides study guides and sample questions.

Cost to Get Licensed

Here’s what you can expect to pay:

Total initial costs usually range from $700 to $1,500, depending on your needs and prep.

Renewing Your HVAC License in California

HVAC licenses are valid for 2 years. To renew, you must:

• Submit the CSLB renewal application before your expiration date
• Pay the renewal fee (currently $450)
• Keep your bond and Workers’ Comp (if required) up to date

No additional testing is required for renewal.

Working Without a License: What Are the Risks?

Operating as an HVAC technician in California without a C-20 license is a misdemeanor offense. Penalties may include:

• Fines of up to $15,000
• Criminal charges
• Ineligibility for future licensing
• Consumer lawsuits or nonpayment for unlicensed work

If you advertise as licensed without being licensed, the CSLB may issue additional penalties.

Why Licensing Matters Beyond the Law

Getting licensed does more than check a legal box — it:

• Builds trust with customers and general contractors
• Helps you win commercial contracts and government bids
• Protects you legally and financially
• Sets your business up for long-term credibility

For anyone looking to run a legitimate, long-term HVAC business in California, licensing is the foundation.

This guide is for general informational purposes only and is not legal or licensing advice. Requirements, fees, and regulations are subject to change by the California Contractors State License Board (CSLB) or other authorities. Always verify current rules and procedures directly with the CSLB or a qualified licensing professional before making business or licensing decisions.