Adaptive skill practice — find your level, get sharper.
Refrigerant Regulations practice
EPA 608 Core — ozone rules, refrigerants, and safety
Master the EPA Section 608 Core material every HVAC technician certifies on — why stratospheric ozone matters and how CFC chlorine destroys it, the refrigerant families (CFC, HCFC, HFC, HFO) and what ODP and GWP mean, the Montreal Protocol and the AIM Act HFC phasedown, the Clean Air Act rules of the trade (the venting prohibition, technician certification types I/II/III/Universal, the refrigerant sales restriction, record-keeping, and leak-repair requirements), the three Rs — recover, recycle, reclaim — and the safety essentials for handling refrigerant and cylinders. Every question teaches the rule and names the classic mix-up (recycle vs reclaim, exempt release vs illegal venting). Authored from the public EPA regulations (40 CFR Part 82) using original questions — never real exam items. Keentune is independent study practice, not affiliated with the EPA or any EPA-approved certifying organization, and does not guarantee a pass. Educational only.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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