EPA 608 Core and Type I, II, III Explained (2026 Guide)

EPA 608 has four parts — Core plus Type I, II, and III. Here's exactly what each one certifies you to work on, the key facts per type, and how Universal actually works.

The Cert Climb TeamEditorial team
4 min read

The single most confusing thing about EPA Section 608 is that it isn't one exam — it's four. Core, Type I, Type II, and Type III each stand alone, each has its own 25 questions, and each is scored independently at a 70% pass line (18 of 25).

Get the structure straight and the whole credential makes sense. Here's what each part certifies you to do.

Core — the foundation everyone needs

Core is not a "Type." It's the shared rulebook that every certified technician must pass regardless of which appliances they work on.

Core tests the environmental and legal groundwork:

  • Ozone depletion, the Clean Air Act, and the Montreal Protocol
  • Section 608 rules — the venting prohibition, the sales restriction, recordkeeping
  • The 3 R's — Recover, Recycle, Reclaim
  • Cylinder rules — DOT-approved cylinders, the gray-body/yellow-top recovery cylinder, the 80% fill limit, the 5-year hydrostatic retest, and no cylinder-to-cylinder transfer
  • Safety — PPE, and never pressurizing a system with oxygen
  • Leak detection, evacuation, DOT shipping, and refrigerant transitions (SNAP, oils)

You cannot earn any Type certification's real-world value without Core. Think of it as the trunk; the Types are branches.

Type I — small appliances

Type I certifies you to work on small, factory-sealed appliances charged with 5 pounds or less of refrigerant.

That means:

  • Refrigerators
  • Window air conditioners
  • Dehumidifiers
  • Vending machines

The facts that matter most for Type I are the recovery requirements:

  • 90% recovery when the appliance's compressor is working
  • 80% recovery when the compressor is not working
  • 90% recovery when using a self-contained (active) recovery machine

You also need the difference between two recovery methods:

  • System-dependent (passive) — relies on the appliance's own compressor to push refrigerant out
  • Self-contained (active) — uses a separate powered recovery machine

Memory hook: "90 hot / 80 cold" — 90% with a running (hot) compressor, 80% with a dead (cold) one. And "5 and 5" — small appliance is 5 lb or less, cylinders retest every 5 years.

Type II — high-pressure appliances

Type II certifies you to work on high- and very-high-pressure appliances.

That covers most of residential and commercial HVAC/R:

  • Split-system air conditioners
  • Heat pumps
  • Supermarket refrigeration
  • Systems running HCFC-22 (R-22) and R-410A

The signature Type II facts are the annualized leak-rate thresholds that force a repair:

  • 10% for comfort cooling
  • 20% for commercial refrigeration
  • 30% for industrial process refrigeration

Once a leak exceeds the threshold, it must be repaired within 30 days. Required evacuation vacuum levels vary by equipment age, so work from the EPA regulatory table rather than memorizing one figure.

Type III — low-pressure appliances

Type III certifies you to work on low-pressure appliances — primarily centrifugal chillers running R-11, R-123, or R-1233zd.

The number to remember: evacuate to 25 mm Hg absolute before major repair or disposal.

The key concept: low-pressure systems operate under a vacuum. That flips the logic of a leak — instead of refrigerant escaping outward, a leak pulls air and moisture IN. Moisture contamination is the central Type III concern.

How Universal works

"Universal" is not a separate exam. You don't book a Universal test. You earn Universal by passing:

Core + Type I + Type II + Type III

That's 100 questions total across the four sections. Because each is scored independently, you can chip away at it — pass Core and Type I now, add Type II and Type III later. When all four are cleared, you hold Universal and can work on any appliance class.

The #1 confusion: open-book vs proctored

Here's the trap that costs people their Universal card.

  • Type I can be taken online, open-book, and unproctored — that's why a mail-in Type I can cost as little as ~$25.
  • Core, Type II, and Type III must be PROCTORED.

And the part that catches everyone: an open-book Core does NOT count toward Universal. To earn Universal, your Core must be proctored. If you knock out an easy open-book Core online, you may be certified for that path — but you'll have to re-sit Core in a proctored setting before it counts toward Universal.

So if Universal is your goal, take a proctored Core from the start. Don't let a cheap open-book Core send you back to the testing center twice.

Quick facts across all four parts

  • 25 questions per section; 70% to pass (18 of 25); each scored independently
  • No prerequisites — you can sit any part as a student
  • Never expires — no renewal, no continuing education
  • Cost runs roughly $25-200 depending on provider and format
  • MVAC (car air conditioning) is Section 609, not 608 — a separate credential entirely

One current wrinkle: the A2L transition

Worth knowing as you certify. New R-410A manufacture and import ended January 1, 2025, and from January 1, 2026 new residential and light-commercial systems use A2L refrigerants — mildly flammable options like R-454B and R-32. Your 608 card stays valid, but A2L equipment needs A2L-rated recovery gear and added safety knowledge, and the exam has begun folding in A2L content.

Ready to test yourself? Try 30 free questions on EPA 608 — no card, no email-trap. For the full breakdown of every section plus a study plan, read our EPA 608 certification study guide.