Licensing in California
California Contractors State License Board (CSLB) — C-20
California licenses HVAC through the CSLB's C-20 Warm-Air Heating, Ventilating, and Air-Conditioning classification, required for any project of $1,000 or more (raised from $500 by AB 2622, effective June 5, 2026) and needing four years of journey-level experience. Your site is built to show your CSLB C-20 license number plainly, because California homeowners verify it on the CSLB site before they book.