This free EPA 608 practice test drills the Core, Type I, Type II, and Type III sections with original multiple-choice questions, every answer explained against EPA's rules.
The real question bank is not public — EPA releases it only to approved certifying programs — so these questions test EPA's published topics instead.
You need 70 percent to pass each closed-book section, and 84 percent for mail-in Type I.
Core EPA 608 practice questions with answers explained
EPA publishes the topic list for the Core section: ozone depletion, the Clean Air Act and the Montreal Protocol, the venting prohibition, the sales restriction, the "three Rs" — recover, recycle, reclaim — recovery and evacuation techniques, safety, and shipping labels.
Every 608 exam pairs these Core questions with a type section, 25 questions minimum each.
Most of the six below come straight off that list — the rest cover the certification rules behind it — and every explanation names the rule behind the answer.
Before you sit any of it, make sure you know what the credential itself covers — our EPA 608 certification guide explains who legally needs it, what each type allows, and how the exam booking works.
Question 1. Under the federal rule, who must pass an EPA-approved 608 exam?
- A. Only the service manager
- B. Anyone who could reasonably be expected to violate the integrity of the refrigerant circuit while maintaining, servicing, repairing, or disposing of an appliance
- C. Only apprentices
- D. Only technicians who buy refrigerant by the cylinder
Answer: B.
The requirement sits at 40 CFR 82.161 and reaches anyone who could open the circuit on appliances containing CFC, HCFC, or non-exempt substitute refrigerants such as HFCs.
It attaches to the work, not the job title — and an employer may buy refrigerant for its crews only with written evidence that it employs at least one certified technician.
Question 2. The "three Rs" of refrigerant are:
- A. Reduce, reuse, recycle
- B. Recover, recycle, reclaim
- C. Recover, remove, replace
- D. Repair, retrofit, recover
Answer: B.
EPA's Core topic list names recover, recycle, and reclaim together.
They are easy to mix up under exam pressure, so practice telling them apart — recovery pulls refrigerant out of an appliance, recycling cleans it, reclaiming reprocesses it.
Question 3. Which gas do you use to pressurize a system for leak testing?
- A. Oxygen
- B. Compressed air
- C. Nitrogen
- D. Refrigerant vapor
Answer: C.
EPA's Core safety topics state it directly: use nitrogen, not oxygen, for leak testing.
The same topic list carries the other big safety rule — never fill a cylinder more than 80 percent full — so expect the safety questions to cluster on handling.
Question 4. A recovery cylinder may be filled to what maximum?
- A. 100 percent
- B. 90 percent
- C. 80 percent
- D. 70 percent
Answer: C.
Overfilling a recovery cylinder is one of EPA's named Core safety risks: never fill a cylinder more than 80 percent full.
It leaves room for the refrigerant to expand as the cylinder warms.
Question 5. A technician holds a Section 609 card for vehicle air conditioning. Can that technician buy R-410A for a stationary split system?
- A. Yes — any certified technician can buy refrigerant
- B. Yes, if the employer signs for it
- C. No — a 609 card does not cover stationary refrigerant
- D. Only in containers of 2 lb or less
Answer: C.
The sales restriction ties the purchase to the right certification: Section 608 for stationary refrigerants, Section 609 for vehicle air conditioning.
A 609-certified technician cannot buy refrigerant intended for stationary equipment regardless of container size — the small-can exception (cans of 2 lb or less with a self-sealing valve) applies to MVAC refrigerant sold to uncertified DIYers, not to stationary HFCs.
Question 6. How long does EPA 608 certification last?
- A. 3 years
- B. 5 years
- C. It does not expire
- D. Until you change employers
Answer: C.
EPA states that Section 608 certification credentials do not expire — no renewal exists to schedule.
EPA has reserved the right to require recertification someday, but only by publishing a notice in the Federal Register, and no such requirement exists today.
Practice questions are not the exam — and EPA's rules change
Type I practice questions: small appliances
Type I covers small appliances: units fully manufactured, charged, and hermetically sealed in a factory with 5 pounds or less of refrigerant — household refrigerators, window and portable air conditioners, PTACs and PTHPs, dehumidifiers, vending machines, and water coolers.
The exam pairs at least 25 Core questions with at least 25 Type I questions, and Type I is the flexible one: organizations offering only Type I may run it on-site or by mail, with the mail-in version carrying its own 84 percent bar.
Question 1. Which of these is a "small appliance" under EPA 608?
- A. A residential split-system heat pump
- B. A household refrigerator
- C. A centrifugal chiller
- D. The air conditioning in a delivery van
Answer: B.
A small appliance is fully manufactured, charged, and hermetically sealed in a factory with 5 pounds or less of refrigerant.
The split-system heat pump is Type II work, the chiller is Type III, and vehicle air conditioning falls under Section 609 entirely.
Question 2. With recovery equipment manufactured after November 15, 1993 and the compressor operating, a small appliance must be recovered to:
- A. 90 percent of the charge
- B. 80 percent of the charge
- C. 0 inches of mercury vacuum
- D. 25 mm Hg absolute
Answer: A.
Small appliances recover to 90 percent of the charge when the compressor works and 80 percent when it does not — or you can evacuate the appliance to 4 inches of mercury vacuum.
The 0-inch and 25 mm Hg figures belong to the Type II and Type III evacuation tables, not to small appliances.
Question 3. You pass a mail-in Type I test. Can that score count toward Universal certification?
- A. Yes — type passes always combine
- B. No
- C. Only with a perfect score
- D. Only within 30 days of passing
Answer: B.
A mail-in Type I pass cannot count toward Universal, and neither can an open-book Core.
What does combine: passing scores on the proctored Type I, Type II, and Type III tests, which you can sit separately and add up to Universal.
Question 4. A packaged terminal air conditioner (PTAC) in a hotel room needs its sealed system opened. Which certification covers the work?
- A. Type I
- B. Type II
- C. Type III
- D. None — PTACs are exempt
Answer: A.
EPA's small-appliance definition names PTACs and PTHPs explicitly, alongside vending machines, water coolers, and dehumidifiers.
Opening the sealed system on any of them is Type I work.
Question 5. An uncertified apprentice is servicing window units. When is that legal?
- A. Never — everyone on refrigerant must be certified
- B. Only while closely and continually supervised by a certified technician
- C. For the first 2 years of the apprenticeship
- D. Whenever the shop owner approves it in writing
Answer: B.
The apprentice exemption requires close, continual supervision by a certified technician, and the supervising technician and the apprentice share responsibility for compliance.
There is no time limit in the rule — any "2-year apprentice limit" you read elsewhere is not in 82.161(a)(2).
Type II practice questions: high-pressure systems
Type II is the workhorse certification: it covers medium-, high-, and very-high-pressure appliances — everything except small appliances, MVACs, and MVAC-like equipment.
Residential split systems and heat pumps sit here, because EPA classifies R-410A as a high-pressure refrigerant.
EPA's published Type II topics include leak detection, the leak-repair rules, recovery requirements sized by appliance charge, and the limit on system-dependent recovery equipment.
Question 1. EPA classifies R-410A as what kind of refrigerant?
- A. Very high pressure
- B. High pressure
- C. Medium pressure
- D. Low pressure
Answer: B.
The classic trap question.
Many prep sources call R-410A "very high pressure," but EPA's own definition puts it in the high-pressure class alongside R-22, R-407A, R-407C, and R-502.
Type II covers all three pressure classes — medium, high, and very high — so the classification matters for the exam and for which column of the evacuation table applies.
Question 2. A high-pressure appliance holds 200 lb or more of refrigerant. Your recovery equipment was manufactured after November 15, 1993. To what vacuum must you evacuate it?
- A. 0 in. Hg
- B. 10 in. Hg
- C. 15 in. Hg
- D. 25 mm Hg absolute
Answer: B.
High-pressure appliances at 200 lb and above evacuate to 10 inches of mercury; under 200 lb, they evacuate all the way to 0.
Medium-pressure appliances have their own column — 15 inches of mercury at 200 lb and above — and low-pressure appliances evacuate to 25 mm Hg absolute, which is the Type III answer.
Question 3. An industrial process refrigeration appliance charged with more than 50 lb of R-22 is leaking above its allowable rate. What leak-rate threshold triggers the repair requirement?
- A. 10 percent
- B. 20 percent
- C. 30 percent
- D. 50 percent
Answer: C.
The thresholds at 40 CFR 82.157 are 20 percent for commercial refrigeration, 30 percent for industrial process refrigeration, and 10 percent for comfort cooling and other appliances.
They apply to appliances holding 50 or more pounds of class I or class II refrigerant — the ozone-depleting kind.
Question 4. Do those leak-repair thresholds apply to an appliance charged only with HFC refrigerant?
- A. Yes — the thresholds cover every refrigerant
- B. No — they cover ozone-depleting refrigerants only
- C. Only above 15 lb of charge
- D. Only for industrial process refrigeration
Answer: B.
EPA's 2020 rule removed the 40 CFR 82.157 leak-repair requirements for appliances using only substitute refrigerants such as HFCs, while keeping the certification, sales-restriction, evacuation, and safe-disposal requirements for them.
HFC leak repair returned under a different rule: the AIM Act's Emissions Reduction and Reclamation rule re-imposed leak repair from January 1, 2026 on appliances with 15+ lb of refrigerant above a GWP of 53 — and it excludes residential and light-commercial air conditioning and heat pumps entirely.
Question 5. Once a covered appliance exceeds its leak-rate threshold, how long does the owner have to repair it?
- A. 30 days
- B. 120 days
- C. One year
- D. 10 days
Answer: A.
The owner must repair within 30 days — extended to 120 days when an industrial process shutdown is needed — and a certified technician must perform the leak inspection.
A chronic leaker gets reported too: an appliance that loses 125 percent or more of its full charge in a calendar year must be reported to EPA by March 1 of the following year.
Question 6. On which systems is system-dependent (passive) recovery equipment banned?
- A. Systems containing more than 15 lb of refrigerant
- B. Systems containing less than 5 lb
- C. All high-pressure systems
- D. Low-pressure chillers only
Answer: A.
EPA's Type II topic list pairs the recovery requirements — sized under and over 200 lb — with the ban on system-dependent recovery equipment on systems containing more than 15 lb of refrigerant.
Bigger charges need active recovery.
Type III practice questions: low-pressure chillers
Type III covers low-pressure appliances — in practice, the chiller room.
EPA's definition names R-11, R-123, R-113, and R-245fa as the low-pressure refrigerants, and the published topic list leans into the procedures only chiller work demands: heating oil before removing it, introducing vapor before liquid when recharging, and equipment-room refrigerant sensors under ASHRAE 15.
Question 1. Which of these is a low-pressure appliance under EPA 608?
- A. A residential split-system air conditioner
- B. An R-123 centrifugal chiller
- C. A supermarket display case
- D. A window air conditioner
Answer: B.
Type III exists for chillers running R-11, R-123, R-113, or R-245fa — big machines at low pressure, with a procedure set that has nothing in common with anything mounted on a roof or a wall.
Question 2. What is the required evacuation level for a low-pressure appliance, using recovery equipment manufactured after November 15, 1993?
- A. 0 in. Hg
- B. 10 in. Hg
- C. 15 in. Hg
- D. 25 mm Hg absolute
Answer: D.
Low-pressure appliances evacuate to 25 mm Hg absolute — the odd unit out in the evacuation table, measured in millimeters of mercury absolute instead of inches of mercury.
That switch is exactly why the exam asks it.
Question 3. Before removing oil from a low-pressure chiller, you must:
- A. Heat the oil to 130 °F
- B. Chill the oil first
- C. Purge the oil with nitrogen
- D. Filter-dry it first
Answer: A.
EPA's Type III topic list states it as a straight recall item: heat the oil to 130 °F before removing it.
Worth the point — it is the kind of question that separates people who studied the topic list from people who skimmed.
Question 4. When recharging a low-pressure system, you introduce:
- A. Liquid first, to save time
- B. Vapor first, to avoid freezing water in the tubes
- C. Nitrogen first
- D. Either — it makes no difference
Answer: B.
EPA's published Type III topics give the reason in the same breath: introducing vapor before liquid when recharging avoids freezing water in the tubes.
Question 5. Under ASHRAE 15, what must the equipment room of an R-123 chiller have?
- A. A refrigerant sensor
- B. A backup condenser
- C. A dedicated operator on site at all times
- D. Double-wall piping
Answer: A.
EPA's Type III topic list names ASHRAE 15 equipment-room refrigerant sensors as required for R-123.
The requirement is about the room the chiller sits in, not the chiller itself.
How to use practice tests to pass the first time
Know exactly what the bar is.
The passing score is 70 percent on the closed-book Type I, Type II, Type III, and Universal tests, and 84 percent for mail-in Type I.
EPA states the bar as a percentage of the section, not a count of missed questions, so a practice set is a measuring stick for the topics — not a simulation of the grade.
Know the shape of the real thing.
Every 608 exam pairs at least 25 Core questions with at least 25 questions for each type you sit, and the Universal test is 100 questions.
You can take Universal in one sitting or build it from separate type passes — banking a strong Type I first and adding Types II and III as your work demands them is a legitimate route, and practice tests are how you find out which sections you are ready to bank.
Practice the way the exam is given.
The closed-book tests are proctored in a secure environment, and the proctor verifies photo identification before you start.
So run practice sections closed-book: no notes, no tabs, no pausing to look up the evacuation table.
An open-book Core and a mail-in Type I both exist, but neither can count toward Universal — if Universal is the goal, train for the proctored format from the start.
Drill against EPA's own syllabus.
EPA publishes the topic list for the Core section, and separate lists for Type II and Type III — after every practice miss, go read that topic on EPA's page instead of memorizing the answer.
Two things no practice test can honestly promise: EPA does not review or approve study materials of any kind — only certifying programs are approved — and the real question bank is not public.
EPA releases it only to approved certifying programs, and our research found no public confirmation that it has been rewritten for the AIM Act.
Treat any source selling "real 608 exam answers" with the suspicion that fact deserves.
- Retake each practice section above until you clear 70 percent closed-book, in one sitting
- Re-read EPA's published topic list for every question you missed — not just the answer
- Confirm your certifying organization's format, fees, and retake policy before test day
- Bring photo ID — the proctor must verify it before the test starts
- If Universal is the goal, book the proctored versions: mail-in Type I and open-book Core do not count toward it
If a section beats you anyway, the retake is between you and your certifying organization.
EPA does not regulate prices or retake policies, and our research did not confirm individual organizations' rules — ask before you book.
The card itself never expires once you pass, and a certified technician is exactly who shops want on refrigerant calls: when you are ready, our HVAC technician jobs board shows who is hiring.
This page is career information, not legal advice. Confirm current certification requirements with EPA's Section 608 program before you act on them.