What is the EPA 608 certification?

EPA Section 608 is the federal certification required under the Clean Air Act for any technician who maintains, services, repairs, or disposes of equipment that could release ozone-depleting refrigerants or their substitutes. Anyone who opens a refrigerant circuit on stationary HVAC/R equipment must hold the appropriate type of 608 certification.

What are the four types of EPA 608 certification?

Core covers the fundamentals every technician must know. Type I covers small appliances. Type II covers high-pressure and very-high-pressure appliances. Type III covers low-pressure appliances. Passing the Core plus all three types earns Universal certification.

What is the passing score for the EPA 608 exam?

You must pass each section independently. The Core section and each type must be passed on their own merits — you cannot average a strong section against a weak one. The common minimum is 70 to 72 percent per section, and proctored versions and open-book versions can carry different passing thresholds depending on the approved testing organization.

Does EPA 608 certification expire?

No. Section 608 technician certification does not expire. Once you pass and receive your card it is valid for the rest of your career with no renewal, continuing education, or refresher requirement.

Guide · Updated June 2026

EPA 608 certification in 2026: what the exam actually tests

If you open a refrigerant circuit on stationary air-conditioning or refrigeration equipment in the United States, federal law requires you to be certified under Section 608 of the Clean Air Act. It is one of the few credentials in the trades that is genuinely mandatory rather than merely helpful — and one of the few that, once earned, lasts the rest of your career. Here is the verified picture of what the exam covers in 2026, sourced from the EPA's own program documentation.

What the certification is for

Section 608 governs the handling of refrigerants — both the older ozone-depleting CFCs and HCFCs and their HFC and A2L substitutes. The certification exists to make sure technicians recover refrigerant properly instead of venting it, because venting most refrigerants to the atmosphere has been prohibited under the Clean Air Act for decades. Practically, you need the right type of 608 card to buy regulated refrigerant and to legally service the equipment that holds it.

The four certification types

The exam is built in modules. Every candidate takes Core, then adds one or more equipment types. Pass Core plus all three types and you hold Universal certification.

Type	What it covers	Typical equipment
Core	Fundamentals every technician must know — required for all types	Clean Air Act rules, refrigerant recovery/recycling/reclamation, ozone depletion, safety, leak repair concepts
Type I	Small appliances	Factory-charged, hermetically sealed units — domestic refrigerators, window AC units, PTACs, vending machines, small dehumidifiers
Type II	High-pressure (and very-high-pressure) appliances	Residential and commercial split systems, heat pumps, supermarket racks, most equipment using R-410A, R-22, R-404A and newer A2L blends
Type III	Low-pressure appliances	Low-pressure chillers (typically using refrigerants like R-123 / R-11)
Universal	All of the above	Core + Type I + Type II + Type III passed together

The practical takeaway: most HVAC field techs need at minimum Core + Type II, because the bulk of residential and commercial work is high-pressure equipment. Universal is the goal for anyone who wants to work across all stationary refrigerant equipment without a coverage gap.

How the exam is scored

Each section stands on its own. You pass Core and each type independently — a strong Core score will not rescue a failed Type II. The common minimum is around 70 to 72 percent per section, and the threshold can differ between proctored and open-book deliveries depending on the EPA-approved testing organization administering the exam. Because the sections are scored separately, the smart strategy is to drill each module to a comfortable margin rather than relying on an overall average.

Open-book vs. proctored

The Type I (small appliances) exam has historically been available in an open-book / mailed format through some approved organizations, while Type II, Type III, and Universal generally require a closed-book, proctored exam. Open-book deliveries typically carry a higher passing percentage to compensate. Always confirm the format and passing score with the specific approved organization you test through.

The topics that trip people up

Recovery requirements by equipment type — the required recovery levels and procedures differ for small appliances, high-pressure, and low-pressure systems. Mixing these up is a classic exam error.
Venting and the Clean Air Act timeline — knowing which refrigerants are prohibited from venting and the regulatory history behind it.
Refrigerant identification and substitutes — the shift toward lower-GWP and A2L refrigerants means the exam increasingly expects familiarity with newer blends, not just legacy refrigerants.
Leak repair and recordkeeping thresholds on larger appliances.
Safety — pressure, PPE, and handling of flammable (A2L) refrigerants.

Does it expire?

No. Section 608 technician certification does not expire. There is no renewal, no continuing-education requirement, and no periodic refresher. Once you pass and receive your card, it is valid for life. That is part of why it is worth getting the broadest certification you reasonably can the first time — you will likely never sit for it again.

Drilling for the EPA 608 exam?

See the EPA 608 study deck → 604 source-cited study cards spanning Core, Type I, II and III — with a wrong-answer breakdown on every card.

The TradesmanPass EPA 608 Universal deck is organized around the same Core / Type I / II / III structure the exam uses, so you can drill module by module to a passing margin before you sit down. Every card cites the rule or principle behind the answer.

Sources: U.S. EPA — Section 608 Technician Certification program pages (epa.gov/section608), including the certification types and Test Topics documentation; EPA Clean Air Act Section 608 refrigerant rules. Passing-score percentages and open-book vs. proctored formats vary by EPA-approved testing organization — confirm with your chosen exam provider before testing. TradesmanPass is an independent study resource and is not affiliated with the U.S. EPA. This page is informational and not a substitute for the official EPA regulations.