EPA 608 test prep

EPA 608 Test Prep — Start Here

The real exam is Core plus the type section(s) you're testing for — 25 questions each, 70% to pass a section. Study the tables, drill your sections, then run exam mode. Everything is free, and every answer carries its CFR citation.

Rules current as of October 23, 2026.

1 · Learn the tables

Evacuation Levels (Table 1) →Required evacuation by pressure class and charge size, split by recovery equipment made before vs after Nov 15, 1993 — plus the 0 psig non-major and 5 psig oil-change rules. Leak-Rate Triggers & Repair Clocks →10/20/30 triggers, the 30-day clock, 120-day shutdown window, retrofit plans, verification tests, chronic leakers — and the 50 lb vs 15 lb coverage split. Key Dates →Jul 1 1992, Nov 15 1993, Nov 14 1994, Nov 15 1995, Dec 31 1995, and the Montreal Protocol — with the traps built around them named. Certification Types →Type I / II / III / Universal scope, who needs certification, the apprentice rule, and the sales restriction. Not sure which type you need? Start here.

2 · Drill your exam part

Core →Ozone science, the venting prohibition, certification rules, sales restrictions, the definitions. Everyone takes Core. 22 questions. Type I — Small Appliances →Factory-sealed units at 5 lb or less: the 80% / 90% recovery rules, system-dependent limits, process stubs. 22 questions. Type II — High-Pressure →Table 1 evacuation levels, major maintenance, verification tests, leak inspections. 22 questions. Type III — Low-Pressure →Chillers: 25 mm Hg absolute, pressurizing instead of evacuating, heat before nitrogen. 22 questions. Recent Rule Changes →Where the old exam keys are now wrong: current triggers, the Jan 1, 2026 15-lb HFC rule, chronic leakers, ALD. 14 questions.

3 · Test yourself like it's real

Exam Mode — 25-Question Mixed Test →25 questions drawn at random from all 102 in the bank, the 70% pass mark (18 of 25) shown up front, and a score summary with a per-section breakdown at the end.

Free Tools for HVAC Pros — Facebook group →Studying with other techs beats studying alone. Bring your hardest 608 question — the group works through rule changes and field problems together.

Ready for the real test?

Everything here is free prep — practice questions and study tables. The certification itself comes from a proctored exam run by an EPA-approved certifying program. Prep is not certification.

One route in: an online prep course that walks you through the material and leads to booking the proctored exam. The exam fee is separate — the course is preparation, not the test itself.

HeatSpring EPA 608 Prep Course →

Or book the exam directly with an EPA-approved program: ESCO Institute (online proctored or in person) · Mainstream Engineering (EPATest.com)

Disclosure: we may earn a commission if you enroll through our link, at no extra cost to you.

The free tools behind the answers

PT Chart & Superheat/Subcooling Calculator →Saturation pressures for R-410A, R-454B, R-32, R-22 and more — the numbers behind half the exam. Refrigerant Log →Tracks every add, runs the leak-rate math for you, and watches the 30-day repair clock and chronic-leaker line. EPA Job Briefing →Enter the system you're about to open and get the do's and don'ts for that job, with citations.