California HVAC Exam Prep

In California, HVAC contracting requires the C-20 specialty classification issued by the CSLB. Technicians who are not contractors work as employees of a C-20 contractor; they do not need a state technician license, but federal law requires EPA Section 608 certification for anyone who maintains, services, repairs, or disposes of equipment containing regulated refrigerants.

C-20 candidates follow standard CSLB rules: 4 years of journey-level experience, a $450 application, and the Law and Business exam plus the C-20 trade exam through PSI. Mechanical work falls under the 2025 California Mechanical Code (Title 24, Part 4) and the 2025 California Energy Code (Part 6), both effective January 1, 2026.

California recognizes the following HVAC credential types:

• C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor - CSLB specialty classification for HVAC contracting.
• EPA Section 608 Technician Certification - Federal certification in Type I (small appliances), Type II (high-pressure), Type III (low-pressure), or Universal; it does not expire.

The C-20 path involves two computer-based multiple-choice exams administered by PSI: the Law and Business exam and the C-20 trade exam. EPA Section 608 exams are offered by EPA-approved certifying organizations. Review the current PSI candidate information and your certifying organization's materials for formats and time limits.

Passing standards for the CSLB exams are set by the board and its testing vendor and vary by exam; confirm the current requirement with the CSLB or PSI. Passing rules for EPA 608 exams are set by the EPA-approved certifying organizations that administer them.

Typical requirements for California HVAC credentials include:

• For the C-20 license: 4 years of journey-level experience, a completed CSLB application with the $450 fee, and passing the Law and Business and C-20 trade exams.
• For refrigerant work: EPA Section 608 certification, required federally for anyone who maintains, services, repairs, or disposes of equipment containing regulated refrigerants.

Requirements can change. Always confirm current licensing rules with the official state licensing authority before applying.

C-20 candidates pay the standard CSLB fees: a $450 nonrefundable application fee and an initial license fee of $200 (sole owner) or $350 (non-sole owner) covering 2 years, with exam fees paid to PSI. EPA 608 exam fees are set by EPA-approved certifying organizations and vary. Always confirm current fee amounts with the CSLB or your certifying organization before submitting payment.

A focused 4 to 6 week study plan works well for most candidates:

• Week 1-2: Review the fundamentals of EPA 608 Certification and Refrigeration and Air Conditioning.
• Week 3-4: Work through Heating Systems and California-specific mechanical and energy code rules, then take a full-length practice test.
• Week 5-6: Review every missed question, drill weak areas, and simulate exam timing.

Practice topics on ExamsLib cover EPA 608 Certification, Refrigeration and Air Conditioning, Heating Systems.