California · Professional resources
Your California training starting point.
Match the resource to your credential before you choose a course.
Named agency resource
California Contractors State License Board
Use CSLB to find the C-20 HVAC classification and current renewal steps. Check any training rule for your credential with the board.
Open the licensing resourceOnline continuing education · Separate expense
Approximately $40
Online continuing education is a separate expense. This is a planning estimate; confirm the actual fee, course hours, provider approval, and credit eligibility for your state and credential before enrolling.
Check your state and credentialCheck four things before enrolling.
- The exact credential and work classification.
- The current renewal deadline and required hours, if any.
- The approval of the provider and the specific course.
- How completion is reported and which records you must keep.
Federal refrigerant certification
Use EPA’s Section 608 requirements for covered work. A federal refrigerant credential and a state contractor license serve different purposes.
EPA certification requirements and programsResource review: October 12, 2026. Confirm the current rule with the authority before paying for a course. HVAC.info lessons carry no state renewal credit.