HVAC Certification Exam Prep and Refrigerant Guides
Match your HVAC work to the right certification route, then verify the current federal refrigerant rules and testing-program terms.
HVAC certification is not one universal license. The federal Section 608 credential covers refrigerant handling on stationary equipment, while state and local contractor or journeyman rules remain separate.
Castleport currently publishes an EPA 608 owner page with the four route choices, a counted public-topic inventory, current score boundaries, and a free browser-only Core check. Start with the work you actually do.