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.
Choosing a professional HVACR credential? Compare the Traditional and CHP-5 routes with the free NATE certification guide and 15 practice questions.
Studying for the NATE Core? Use the free NATE exam prep guide for 25 original questions, two worked examples, and a four-week plan.
Ready for a longer self-check? Try the free NATE Core practice test with 50 original questions, sourced explanations, and a manual topic score sheet.
Choosing an ESCO Group credential? Compare HVAC Excellence certification levels, requirements and remote fees, then review 20 free fundamentals questions.
Want a longer set? Try the free HVAC Excellence practice test with 55 original questions, sourced explanations, and a manual score sheet.
Studying refrigerant-handling rules? Use the free EPA 608 cheat sheet for conditional recovery levels, key numbers, and 16 self-checks.
Working on vehicle A/C? See the free EPA 609 certification guide for approved programs, costs, and 25 practice questions.
Want more vehicle A/C practice? Try the free EPA 609 practice test with 50 original questions, sourced explanations, and no signup.
Guides
EPA 608 Exam Prep
The 2026 route guide, 25 original Core questions, 92-bullet public topic map, federal-versus-provider boundary, and current A2L/HFC rule context.
EPA 608 Universal practice test
100 free questions across Core and Types I, II, and III, with sourced explanations and a section-by-section answer key.
EPA 608 certification online
Understand how EPA 608 certification works online and what to verify before choosing an approved testing program.
EPA 608 Type 3 practice test
50 free questions in two Type III practice tests for low-pressure appliances, with sourced explanations.