EPA 608 Practice Test: Free Prep, What's on the Exam and How to Pass

You can take a free EPA 608 practice test from ESCO Institute, an EPA-approved certifying organization that posts free Core, Type I, Type II and Type III practice exams online. The real exam has a 25-question Core section plus 25 questions for each equipment type, and the passing score on a proctored, closed-book test is 70 percent.

New to HVAC? We recommend the CourseCareers HVAC Course. It's our course, so we're biased, but it teaches the refrigeration basics the 608 assumes you know. It doesn't include EPA 608 certification or the exam.

Below are the exam sections, a study plan, our own sample questions and test-day tips. For the bigger picture, see how to become an HVAC technician with no experience.

Key takeaways

• Free practice: ESCO Institute has free online practice exams for Core, Type I, Type II and Type III.
• Format: 25 questions per section. You must pass Core plus at least one type. Universal is all four sections, 100 questions.
• Passing score: 70 percent on proctored, closed-book tests (18 of 25 per section). Mail-in Type I tests need 84 percent.
• Why it matters: it never expires, and only Section 608 certified techs can buy refrigerant for stationary AC and refrigeration equipment.
• Our pick: the CourseCareers HVAC Course ($499, or four payments of $150) for HVAC basics first. It doesn't include EPA 608 certification.

What's on this page

• Free EPA 608 practice tests
• What's on the exam
• Key topics in plain English
• Sample questions
• Study plan
• Test-day tips
• Why we recommend our HVAC course
• What to do next
• FAQ

Where to Find a Free EPA 608 Practice Test

The best free practice comes from organizations that actually give the exam. Start with ESCO Institute, then use the EPA's topic list as your checklist.

ESCO Institute's free practice exams

ESCO is an EPA-approved certifying organization that offers remote testing. Its free practice exams page has Core, Type I, Type II and Type III tests, plus extra practice on R-410A and low-GWP refrigerant safety.

One catch: ESCO says it released an updated test bank in August 2026, and its 2018 exam stays available until January 1, 2027. Its practice page has tests for both versions, so practice with the one you'll take. ESCO also notes that its practice questions aren't the actual exam questions.

Other free resources

• The EPA's test topics. This list is the closest thing to an official syllabus.
• Mainstream Engineering. This approved organization offers free training software on its EPA 608 page.
• Your school, union or employer. The EPA's list includes trade schools, union training centers and some employers, so ask what prep they provide.

What's on the EPA 608 Exam: Core, Type I, Type II and Type III

The exam has four sections. Everyone takes Core, then adds the type that matches their equipment, or all three for Universal. You need it if you attach gauges, add or remove refrigerant, or otherwise open a refrigerant circuit.

The federal rule for certifying programs sets the passing score at 70 percent. On 25 questions that's 18 correct, which matches the 72 percent Mainstream Engineering lists. Questions come from an EPA test bank.

Open book or closed book?

Mostly closed. Type II, Type III and Universal tests are closed book, and so is Type I when taken for Universal. Type I-only programs may use a mail-in format with an 84 percent passing score, and Mainstream offers Type I online, open book. The EPA's certification requirements page adds that an open-book Core can't count toward Universal.

Which type do you need?

Match it to your equipment. If you're starting out, we suggest Universal, so you won't need to retest when your work changes. For how the 608 compares with NATE, see EPA 608 certification types and exam details.

Key EPA 608 Topics in Plain English

We group the EPA's topics into six areas. Here they are in plain English, based on the EPA's own pages.

Ozone depletion

Chlorine and bromine atoms destroy ozone in the stratosphere, and the EPA says one chlorine atom can destroy over 100,000 ozone molecules. Less ozone lets in more UVB, which is linked to skin cancers and cataracts. CFCs have a higher ozone-depletion potential than HCFCs.

Clean Air Act rules

• No intentional venting of ozone-depleting refrigerants or their substitutes during service or disposal. Small "de minimis" releases during good-faith recovery are allowed, and a few substitutes are exempt.
• Sales restriction: only Section 608 certified techs can buy refrigerant for stationary equipment. Section 609 (car AC) certification doesn't count.
• Phaseouts: U.S. production and import of R-22 ended on January 1, 2020.

Recover, recycle and reclaim

Under the EPA's definitions, recover means removing refrigerant into an outside container without necessarily testing or processing it. Recycle means cleaning it for reuse in the same owner's equipment. Reclaim means reprocessing it to AHRI Standard 700 purity and verifying it.

Leak repair

Owners of appliances with 50 or more pounds of ozone-depleting refrigerant must act when yearly leaks pass a trigger rate. It's 30 percent for industrial process refrigeration, 20 percent for commercial refrigeration and 10 percent for comfort cooling. They have 30 days to repair the leak or to make a plan to retrofit or retire the system.

Safety

Know your PPE, the risk of filling a cylinder more than 80 percent full, and why you leak test with nitrogen, not oxygen, through a regulator and relief valve. Types II and III add ASHRAE Standard 15 equipment room rules.

Refrigerant types and pressures

Learn to tell CFCs, HCFCs and HFCs apart. Federal rules put high-pressure refrigerants like R-22 and R-410A at 170 to 355 psia at 104°F. Low-pressure ones like R-123 sit below 45 psia at that temperature.

Sample EPA 608 Practice Questions (Written by Us)

We wrote these to match the EPA's topic list. They aren't real exam items, but they show the style.

1. A home dehumidifier was factory-sealed with 1.5 pounds of refrigerant. Which certification covers servicing it? (a) Type I (b) Type II (c) Type III (d) None. Answer: (a). It's a small appliance.
2. A system runs on R-123. Which pressure class is it? (a) Very high (b) High (c) Low (d) Medium. Answer: (c), so it's Type III work.
3. A comfort cooling system with 80 pounds of an ozone-depleting refrigerant leaks 15 percent a year. What applies? (a) Nothing, it's under 20 percent (b) Repair within 30 days or plan to retrofit or retire it (c) Repair within a year (d) Just a record entry. Answer: (b). The comfort cooling trigger is 10 percent.
4. What should you use to pressurize a system for a leak test? (a) Oxygen (b) Nitrogen, through a regulator and relief valve (c) Nitrogen, straight from the cylinder (d) Oxygen, through a regulator. Answer: (b).

Want more? Take ESCO's free practice exams and look up every miss.

A Step-by-Step EPA 608 Study Plan

Study Core first, then one type at a time. Here's the order we suggest.

1. Choose your target. Pick a type based on your equipment, or aim for Universal.
2. Pick a certifying organization from the EPA's list of approved programs, and get study materials for its current exam.
3. Take a cold Core practice test. Your misses show where to start.
4. Study Core with the EPA topic list. Check off each topic once you can explain it in your own words.
5. Add one type at a time. For Type II and III, practice reading a pressure-temperature chart.
6. Retake practice tests until you clear 18 of 25 with room to spare.
7. Book the proctored exam while the material is fresh.

New to gauges and recovery machines? Read HVAC tools for beginners first.

EPA 608 Test-Day Tips

Bring photo ID, know what's allowed and read carefully.

• Photo ID. Federal rules require proctors to check it, such as a driver's license, passport or military ID.
• Allowed materials. TSTC's guide to the ESCO exam says only a pressure-temperature chart and a calculator are allowed. Check with your provider.
• Remote setup. ESCO offers online proctoring through ProctorU, 24 hours a day. Set up your room and computer early.
• Read to the end. Watch for "not" and "except." TSTC lists up to three hours for the ESCO exam, so there's time.
• Failed a section? TSTC says ESCO retakes cover only the sections you didn't pass. Check your provider's retake rules.
• Keep your proof. The EPA doesn't issue cards. Your certifying organization must send your results, and a wallet card if you pass, within 30 days of the test. Keep a copy of your certificate at your place of business.

Why We Recommend the CourseCareers HVAC Course

The 608 assumes you know how refrigeration systems work. Our HVAC course builds that background for complete beginners.

The CourseCareers HVAC Course covers heating, cooling, ventilation and refrigeration cycles, OSHA-aligned safety and tool use, piping and electrical basics, and how furnaces, condensers, compressors and thermostats work. Lessons include evacuation and vacuum, refrigerant manifolds, and nitrogen purging and leak testing, which overlap with 608 topics.

Your instructor is Tim De Stasio. He started in HVAC in high school and spent 12 years at his first HVAC job. He then founded his own HVAC business, ran it for 10 years and sold it. Today he's an HVAC consultant who designs mechanical systems and trains contractors across North America. He also runs the YouTube channel @TimDeStasioHVAC.

The course costs $499 one time, or four payments of $150 every two weeks. It's self-paced, with a free intro course to try first. Within 14 days of purchase, you can get a refund or switch courses, as long as you haven't taken the final exam.

What it doesn't do: it doesn't include EPA 608 certification or the exam. You'll still take that through an EPA-approved certifying organization. It isn't a comprehensive or advanced course, or a state license. HVAC is hands-on, so pair the lessons with real time on tools and equipment.

What to Do Next

Learn how systems work, practice the 608, then get certified. Registered apprentices can work without the certification for up to two years while a certified tech closely and continually supervises them. We still suggest getting certified early, since only certified techs can buy refrigerant or do this work on their own. See what it takes to get hired as an HVAC apprentice and the best HVAC certifications for beginners.

Our recommendation: If you're new to HVAC, start our free intro course, then take the full CourseCareers HVAC Course to learn how systems work. Meanwhile, use ESCO's free EPA 608 practice tests for Core and your target type. Once you clear 18 of 25 on every section, book a proctored Universal exam.

Frequently Asked Questions

Is the EPA 608 exam open book?
Usually not. Type II, Type III and Universal exams are closed book. Some programs offer Type I in a mail-in or online open-book format, with an 84 percent passing score. An open-book Core can't count toward Universal.

How many questions are on the EPA 608 exam?
Each section has 25 questions. Core plus one type is 50 questions. Universal is 100.

Are free EPA 608 practice tests the same as the real exam?
No. ESCO says its practice questions aren't the actual exam questions. Use them to find weak spots, then study the topics behind your misses.

Can I take the EPA 608 exam online?
Yes, with some providers. The EPA's list of approved programs notes which ones offer remote testing, and ESCO proctors online exams through ProctorU.

Does EPA 608 certification expire?
No. The EPA says Section 608 certification credentials do not expire. The EPA can't replace a lost card, so contact the organization that certified you.

Do HVAC apprentices need EPA 608 certification?
Not while a certified technician closely and continually supervises them. The exemption covers apprentices registered with the U.S. Department of Labor's Office of Apprenticeship or a recognized State Apprenticeship Council, for up to two years from first registering.

What's the best HVAC course for beginners before the EPA 608?
We recommend the CourseCareers HVAC Course. It's ours, so we're biased. It teaches refrigeration cycles, safety and tools, components, and service and maintenance, for $499 or four payments of $150. It doesn't include EPA 608 certification or the exam.

Sources

• EPA: Section 608 Technician Certification Requirements
• EPA: Section 608 Test Topics
• EPA: Certification Programs for Section 608 Technicians (updated Aug 20, 2026)
• EPA: Replacing a Lost Section 608 Card
• EPA: Definitions of Section 608 Terms
• EPA: Refrigerant Sales Restriction
• EPA: Prohibition on Venting Refrigerants
• EPA: Leak Repair Requirements
• EPA: Basic Ozone Layer Science
• EPA: The Phaseout of HCFC-22 (PDF)
• eCFR: 40 CFR 82.161
• eCFR: 40 CFR 82.152
• eCFR: 40 CFR Part 82, Subpart F, Appendix D
• ESCO Institute: Section 608 EPA Certification
• ESCO Institute: Free Practice Exams
• Mainstream Engineering: EPA Section 608
• TSTC Library: ESCO 608 Getting Started
• CourseCareers: HVAC Course (all pages accessed Oct 2026)