How to get an HVAC license in California

Licensing office Contractors State License Board (CSLB) · 1-800-321-CSLB (2752) [15][18]

The license pathway in California

1. 1

   HVAC employee (no state license)

   You can work for wages for a licensed C-20 contractor without a CSLB license. This is where you build the journey-level experience the C-20 license requires. If you connect gauges or add or remove refrigerant, you need EPA Section 608 certification. [1][2][4]

2. 2

   C-20 HVAC contractor

   • 4 years of experience
   • Two exams at PSI: Law and Business, and the C-20 trade exam (closed book, multiple choice, 3.5 hours each)
   • $450 application; $200 initial license for a sole owner ($350 other business types)
   • Every 2 years; $450 active sole-owner renewal

   Lets you bid and contract for heating, ventilating and air-conditioning work, including heat pumps. You need four years of qualifying experience in the last ten years, two passed exams, a $25,000 bond and workers' compensation coverage. [1][3][5][6][7][8][9][10]

Who needs an HVAC license in California

California licenses HVAC businesses, not individual technicians. The Contractors State License Board (CSLB) issues the C-20 Warm-Air Heating, Ventilating and Air-Conditioning license. Its scope covers heating systems, water heating heat pumps, ventilating systems, air-conditioning systems, and the ducts, flues, controls and filters that go with them, including systems that use solar energy.

You need a CSLB license if a job needs a building permit, uses employees, or totals $1,000 or more in labor and materials. You can't split a bigger job into small contracts to stay under $1,000.

If you work for wages for someone else's business and don't control how the work is done, you're exempt. That's why there is no state "HVAC technician" or "journeyman" card in California.

For HVAC heat pumps, CSLB says the C-20 is the classification currently licensed for the work. A B General Building contractor can take the prime contract but must subcontract the heat pump work to a C-20 (or C-36 Plumbing for heat pump water heaters) unless the prime contract includes two or more unrelated trades other than framing or carpentry. [1][3][5]

Experience: the four-year rule

To take the exam, the person qualifying the license (the "qualifier") needs at least four full years of experience in the C-20 trade within the last ten years. Only experience at journey level, or as a foreman, supervisor, contractor or owner-builder, counts.

CSLB defines a journeyman as a fully qualified worker who can do the trade without supervision, or someone who has completed an apprenticeship program. Time as a trainee, helper or apprentice doesn't count as journey-level time on its own.

Someone with firsthand knowledge of your work (an employer, foreman, fellow journeyman, union representative, inspector or homeowner) must certify your experience. Be ready to show documents if CSLB asks.

You can get credit for up to 3 years of the 4 for schooling or training, but at least one year must be practical experience:

• A Certificate of Completion of Apprenticeship in the trade: up to 3 years.
• A four-year degree in a field related to the trade, or in business, accounting or a few other listed fields: up to 2 years (up to 3 for a construction or directly related engineering degree).
• An A.A. degree in building or construction management: up to 1.5 years.

[1][2]

The exams

You take two computer-based exams at a PSI test center: the Law and Business exam and the C-20 trade exam. You get 3.5 hours for each, and you learn whether you passed before you leave. You have 18 months from the date your application is accepted to pass both. If you fail, you wait 21 days before you can pay and reschedule.

The C-20 trade exam is closed book and multiple choice with four choices per question. A calculator is provided. For exams on or after April 1, 2026, CSLB's study guide lists four sections: Planning and Estimating (about 22%), Fabrication, Installation and Startup (38%), Troubleshooting, Repair and Maintenance (20%), and Safety (20%).

Passed results are good for five years. If you pass one exam and fail the other, you only retake the one you failed. Download the C-20 study guide for sample questions and the reference list. [6][7]

Fees, bond, insurance and renewal

• Application: $450 (one classification).
• Initial license: $200 for a sole owner, $350 for other business types. It covers two years.
• Fingerprints: $32 Department of Justice plus $17 FBI (Federal Bureau of Investigation) processing fees, plus whatever the Live Scan site charges.
• Contractor's bond: $25,000, in place before CSLB issues an active license. A separate $25,000 Bond of Qualifying Individual may be needed if the license is qualified by a Responsible Managing Employee or Officer.
• Workers' compensation: C-20 contractors must show coverage even with no employees. The no-employee exemption isn't available to the C-20 class.
• Renewal: every two years. An on-time active renewal is $450 for a sole owner and $700 for other business types.

Exam fees are paid directly to PSI when you schedule. Check the CSLB fee list before you apply. [6][8][9][10]

Apprenticeships and training in California

An apprenticeship is the most direct way to build the experience: you're paid to work under experienced techs while taking classes, and a completion certificate can count for up to 3 years of the C-20 requirement.

• The California Division of Apprenticeship Standards lets you search for apprenticeship and pre-apprenticeship programs.
• United Association (UA) local unions run registered apprenticeships that include HVACR; they typically last five years.
• The U.S. Department of Labor's Apprenticeship Job Finder lists open apprenticeship jobs from employers.
• CSLB notes that community colleges offer vocational classes, and says private vocational schools should be "investigated carefully before paying tuition."

[2][11][12][13]

If you're licensed in another state

California has formal reciprocity agreements with Arizona, Louisiana, Mississippi, Nevada and North Carolina, but only for matching classifications. For the C-20, CSLB's list matches Arizona's air conditioning and refrigeration classes (C-39, C-39R, K-39, K-79, L-39, L-79) and Nevada's C-21. The Louisiana, Mississippi and North Carolina agreements cover only building classes (General Building, plus Residential Remodeling for North Carolina), not HVAC.

To use reciprocity you must have held an active license in good standing in that state for the previous five years, send CSLB a Request for Verification of License completed by your current licensing agency, and file the regular application. CSLB may waive the trade exam but can still require it, and you still take the Law and Business exam.

Out-of-state contractors without reciprocity can still apply the normal way if they meet the experience rules; CSLB counts out-of-state licensed contractor experience. [1][2][14][15][16]

EPA Section 608: the federal certification you'll need

Separate from any state license, federal rules require technicians who maintain, service, repair or dispose of equipment that could release refrigerant to hold EPA Section 608 certification. It's earned by passing an EPA-approved test, and it doesn't expire.

Registered apprentices may work without it for up to two years if a certified technician closely supervises them. Read our EPA 608 certification guide for the four certification types and how the test works. [4][17]

Tips for career changers

• You must be at least 18 to qualify for a CSLB license.
• CSLB has no education requirement, but schooling can shorten the four years (see above).
• No financial requirement applies to getting licensed, apart from the bond and fees.
• Every new applicant must also complete CSLB's asbestos open-book exam before a license is issued.
• Unlicensed contracting is usually a misdemeanor on a first offense, with up to six months in jail and/or a $500 fine plus possible administrative fines of $200 to $15,000.

Questions about your situation? Call CSLB's Licensing Information Center at 1-800-321-2752. [1][2][9][15]

Steps to get licensed in California

1. Get EPA Section 608 certification

   If your job will involve attaching gauges or adding or removing refrigerant, pass an EPA-approved Section 608 test. Type II covers high-pressure equipment other than small appliances and car air conditioners; Universal covers all types. See our EPA 608 guide. [4]

2. Build four years of journey-level experience

   Work in the HVAC trade as a journeyman, foreman, supervisor or owner-builder. Apprenticeship completion or related schooling can replace up to 3 of the 4 years. People who saw your work must sign off on it. [2]

3. Apply to CSLB

   File the Application for Original Contractor's License for the C-20 class with the $450 fee. See CSLB's exam application steps. [8][18]

4. Get fingerprinted and schedule your exams

   Once accepted, you'll get a Live Scan fingerprint packet and a Notice to Schedule. You book and pay for the Law and Business and C-20 exams directly with PSI and have 18 months to pass. [6]

5. Meet the issuance requirements

   After you pass, pay the initial license fee, file a $25,000 contractor's bond, show workers' compensation coverage, and complete CSLB's asbestos open-book exam. [9][10]

Where to get the hours

Programs that train HVAC technicians in or for California, from their own official pages. Listed by type, not ranked.

• State program

  California Division of Apprenticeship Standards (DAS) program search

  California's apprenticeship agency keeps a searchable list of state-approved apprenticeship and pre-apprenticeship programs. A completed apprenticeship can count for up to 3 years of C-20 experience. [2][11]

• Union

  United Association (UA) pipe trades apprenticeships

  The UA's registered apprenticeships include an HVACR track and typically last five years, with paid work plus classroom training at local training centers. [12]

• Other

  Apprenticeship.gov Job Finder

  The U.S. Department of Labor's search tool for open apprenticeship jobs by occupation and location. [13]

• School

  California Community Colleges

  CSLB points applicants to community colleges for vocational classes. Related college degrees can count for 1.5 to 3 years of experience, depending on the degree. [2][11]

Licensed in another state?

Questions people ask