Requirements, license levels, and the issuing authority, sourced from California's official board.
Refrigerant work requires federal EPA Section 608 certification.
| Requirements | California licenses no individual HVAC technician; the state credential is the CSLB C-20 Warm-Air Heating, Ventilating and Air-Conditioning contractor license. Four years of journey-level or higher experience in the classification within the prior ten years, of which up to three years may be substituted by schooling or apprenticeship (at least one year must be practical experience). An asbestos open-book examination is part of licensure. A $25,000 contractor bond must be on file before an active license issues, and a Certificate of Workers' Compensation insurance or self-insurance is mandatory for the C-20 under Business and Professions Code section 7125. A $25,000 bond of qualifying individual applies where the license is qualified by a responsible managing employee, or a responsible managing officer owning under 10% of the voting stock. The C-20 trade examination is weighted planning and estimating 22%, fabrication, installation and startup 38%, troubleshooting, repair and maintenance 20%, and safety 20% (percentages approximate, for examinations scheduled on or after April 1, 2026). Its reference list is built on the 2025 Building Energy Efficiency Standards and the 2025 California Building Code and companion Title 24 codes. CSLB SIDE - fees, from CSLB's published fee list: application for an original license $450 (non-refundable); initial license fee, which covers the first two-year period, $200 sole owner / $350 non-sole owner; additional classification on an existing license $230; replacing the qualifier $230; adding personnel or a limited partner $125 each; license reactivation $450 sole owner / $700 non-sole owner; joint venture application $800; asbestos certification $125; hazardous substance removal certification $125; home improvement salesperson registration $200; duplicate certificate $25; business name change $100; certified license history $67. Fingerprinting is $32 to the Department of Justice plus $17 to the FBI plus the Live Scan rolling fee. Examination fees are paid directly to PSI and are no longer processed by CSLB. CSLB experience rule: at least four years of experience in the classification applied for, credited only at journey level or as a foreman, supervising employee, contractor or owner-builder. CSLB defines a journeyman as a fully qualified experienced worker, as opposed to a trainee, helper, labourer, assistant or apprentice, who can perform the trade without supervision, or a person who has completed an apprenticeship program. Up to three of the four years may be credited to schooling or apprenticeship under 16 CCR 825, but at least one year must be practical experience: a maximum of 1.5 years for an A.A. degree in building or construction management; a maximum of 2 years for a four-year degree in accounting, architecture, business, economics, mathematics, physics or a trade-related field, a professional law degree, or substantial related college coursework; and a maximum of 3 years for a Certificate of Completion of Apprenticeship from an accredited apprenticeship program or union certification, or a four-year degree in construction technology or management or related engineering. Official sealed transcripts must be sent to CSLB for the credit to be evaluated. EXAMINATION. PSI delivers CSLB's examinations by computer at 20 locations in California and 21 nationwide, 8:00am-5:00pm Monday to Saturday. Every applicant sits two examinations, Law and Business plus the trade examination. Both are CLOSED BOOK - no reference materials may be used - and multiple choice with four choices and one best answer; a calculator is provided and there is no penalty for guessing. Each examination is allowed 3.5 hours. CSLB does not publish the passing percentage: it states that candidates are informed at the test site of the percentage of correct answers needed to pass. At the end of the session the candidate is handed a printed pass/fail report; a passing report does not show the overall score, while a failing report shows the overall score and the performance by section. A failed examination may be retaken after 21 calendar days, provided the application has not passed its 18-month void date. |
| Reciprocity | CSLB's reciprocity program covers Arizona, Louisiana, Mississippi, Nevada and North Carolina, but a classification reciprocates only if it appears on CSLB's Reciprocal Classifications List. For the C-20 that list carries mappings from two states: Arizona's C-39 and C-39R Air Conditioning and Refrigeration, K-39 Air Conditioning and Refrigeration, K-79 Air Conditioning and Refrigeration Including Solar, L-39 Air Conditioning and Refrigeration and L-79 Air Conditioning and Refrigeration Including Solar all map to California's C-20; and Nevada's C-1f Heating, Cooling and Circulating Air and C-21 Refrigeration and Air Conditioning both map to the C-20. No HVAC classification is listed for Louisiana, Mississippi or North Carolina. The applicant must have held an active license in good standing in the reciprocal state for the previous five years, file a Request for Verification of License completed by that state's licensing authority, and file the Application for Original Contractor's License. Utah is not on CSLB's reciprocity list; the reciprocal states are Arizona, Louisiana, Mississippi, Nevada and North Carolina, and for the C-20 only Arizona and Nevada carry a mapped classification. |
| Renewal | Two-year renewal; the license expires two years from the last day of the issue month. There is no state continuing-education requirement. Renewal fees from CSLB's fee list: active timely $450 sole owner / $700 non-sole owner; active delinquent $675 / $1,050; inactive timely $300 / $500; inactive delinquent $450 / $750. (The $20 surcharge shown on CSLB's fee list applies to the C-10 electrical classification only, not to the C-20.) |
| Notes | Refrigerant work requires federal EPA Section 608 certification. |
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Sources: www.cslb.ca.gov, www.cslb.ca.gov, www.cslb.ca.gov, www.cslb.ca.gov. Always confirm current requirements with the issuing authority.
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