2026 licensing guide
Warm-Air Heating, Ventilating and Air-Conditioning (C-20) License
A practical 2026 guide to California's Warm-Air Heating, Ventilating and Air-Conditioning contractor classification.
Scope at a glance
Heating, cooling, ventilation, and related duct systems. Always verify the statutory scope with CSLB before contracting.
Requirements and path to licensure
- Document qualifying journey-level experience in the classification
- Submit the correct CSLB application and fees
- Pass required trade and Law & Business exams unless formally waived
- Complete fingerprinting, bond, and license issuance requirements
Practical examples
Projects involving HVAC systems
Original scenario: a contractor should confirm the classification scope before bidding work that combines specialties.
Scenarios are original educational material, not official CSLB exam questions.
Frequently asked questions
Does the Warm-Air Heating, Ventilating and Air-Conditioning (C-20) path include the Law & Business exam?
Most applicants must pass the universal CSLB Law & Business exam plus any required trade examination. Confirm waiver eligibility with CSLB.
Where should I verify current requirements?
Use the official CSLB applicant and classification pages linked below because requirements and fees can change.