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EPA 608 Certification Guide: Types I–IV Explained for New HVAC Techs
A practical guide to EPA Section 608 — the federally-mandated refrigerant handling certification — covering Type I, II, III, and Universal in plain language: what each Type lets you legally work on, the 70% pass threshold, the proctored-Core rule for Universal, where to test (ESCO, Mainstream, RSES), what it costs, and why it does not expire.