EPA 608 Practice Tests

EPA 608 HVAC refrigerant certification practice — Type I, II, III and Universal exams.

33 tests · 489 questions · Free · No signup · NEC 2026
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Based on EPA Section 608 regulations (40 CFR Part 82) & official exam content outlines.  ·  Last reviewed Jun 2026

What Is the EPA 608 Certification?

The EPA Section 608 certification is a federal requirement for any technician who purchases, services, or handles regulated refrigerants. It is required under Section 608 of the Clean Air Act, enforced by the U.S. Environmental Protection Agency (EPA). There is no exception for small quantities — if you buy or vent refrigerant without certification, you are breaking federal law.

There are four types of certification. Most HVAC technicians should aim for Universal certification, which covers all three equipment types:

  • Type I: Small appliances — hermetically sealed systems with 5 lbs or less of refrigerant (refrigerators, window A/C units, dehumidifiers).
  • Type II: High-pressure systems — R-22, R-410A, R-404A, R-134a and other high-side systems. This covers most residential and commercial HVAC equipment.
  • Type III: Low-pressure systems — R-11, R-113, R-123 used in large centrifugal chillers. Less common but required for chiller work.
  • Universal: Passes all three types. The most useful certification to have.

A score of 70% or higher is required on each section. The certification does not expire once earned. The exam is not open book — you need to know the rules and refrigerant properties from memory.

What the Core Section Tests (Everyone Takes This)

The Core section covers environmental regulations that apply to all refrigerant handling, regardless of equipment type:

  • Ozone layer science: How chlorine from CFCs and HCFCs depletes the stratospheric ozone layer that protects life from UV radiation.
  • Montreal Protocol: The international agreement to phase out ozone-depleting substances. CFCs were phased out first, HCFCs (like R-22) followed.
  • AIM Act (2020): U.S. law phasing down HFCs based on global warming potential (GWP), not ozone depletion. R-410A, R-404A, and R-134a are being phased down.
  • No venting rule: It is illegal to knowingly vent refrigerant into the atmosphere. Recovery is required before opening any refrigerant system.
  • Record keeping: Refrigerant purchases of 2 lbs or more must be documented. Records must be kept for 3 years.
2024–2026 Regulation Update: The AIM Act is phasing down HFCs in steps. R-410A production limits tightened in 2025. Lower-GWP alternatives like R-32, R-454B, and R-466A are replacing R-410A in new equipment. The EPA 608 exam now includes questions on A2L refrigerant handling safety — R-32 and R-454B are mildly flammable (A2L class) which requires different handling procedures.
Core — Environmental Regulations Type I — Small Appliances Type II — High-Pressure Systems Type III — Low-Pressure Systems Leak Detection & Recovery Record Keeping
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NEC 2023

EPA 608 Core Exam Practice Test 1

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Free Online EPA 608 Core Exam Practice Test 1This free 25-question practice test covers the EPA 608 Core section, which all technicians must pass regardless of the equipment type they service. Topics include the Clean Air Act Section 608, ozone depletion and global warming, refrigerant types (CFC, HCFC, HFC), recovery vs recycling vs reclaiming, venting prohibitions, leak rates, refrigeration cycle basics, and refrigerant handling rules.

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Free Online EPA 608 Core Exam Practice Test 2This free 25-question practice test covers the EPA 608 Core section — required for all technicians regardless of which equipment type they service. Topics include the refrigeration cycle (compressor, condenser, evaporator, expansion valve), refrigerant types and their GWP/ODP values, lubrication oils, blended refrigerant handling, recovery cylinder identification, non-condensables, the Clean Air Act Section 608 regulations, and safe handling rules.

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Free Online EPA 608 Core Exam Practice Test 3This free 25-question practice test covers the EPA 608 Core exam section — required for all refrigerant technicians. Topics include refrigerant recycling equipment types, R-12 retrofits, recovery cylinder rules, manifold gauge color codes, leak detection methods, nitrogen flushing, refrigerant classification (CFC/HCFC/HFC), POE oil moisture limits, blend types (binary/ternary), pressure-temperature relationships, and vacuum measurement in microns.

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Free Online EPA 608 Core Exam Practice Test 4This free 25-question practice test covers the EPA 608 Core exam section that all refrigerant technicians must pass. Topics include ASHRAE refrigerant safety classifications (toxicity and flammability), ozone depletion mechanics, Clean Air Act penalties, hygroscopic materials, system dehydration, composite refrigerant disposal, small appliance definitions, compressor burnout identification, system flushing procedures, pre-evacuation recovery requirements, cylinder storage rules, and sight glass maintenance.

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Free Online EPA 608 Core Exam Practice Test 5This free 25-question practice test covers the EPA 608 Core exam topics that all refrigerant technicians must master. Topics include the Clean Air Act phaseout schedule, substantial leak rates, recovery of composite refrigerants, HFC vs HCFC vs CFC classification, pressure-temperature relationships, recovery cylinder fill limits, refrigeration cycle components, saturation pressure changes, refrigerant sales restrictions, and pressure unit conversions (psig to psia).

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Free Online EPA 608 Core Exam Practice Test 6This free 25-question practice test covers the EPA 608 Core exam topics required for all refrigerant technicians. Topics include refrigerant migration during shutdown, manifold gauge colors, vacuum levels, compressor temperature behavior, recycling vs. reclaiming, leak detection gases, disposable cylinder rules, recovery speed and ambient temperature, on-site cleaning definitions, refrigerant classification, condenser inlet conditions, and AHRI purity standards.

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Free Online EPA 608 Core Exam Practice Test 7This free 25-question practice test covers core EPA 608 topics for refrigerant certification. Topics include pressure-temperature relationships, compressor burnout diagnosis, AHRI purity standards, recycling vs reclaiming, manifold gauge colors, refrigeration cycle states, recovery speed and temperature, ASHRAE flammability classifications, refrigerant transfer rules, and HFC composition. New questions cover heat pumps, low-loss fittings, refrigerant safety, Section 609, leak repair timeframes, and more.

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Free Online EPA 608 Core Exam Practice Test 8This free 25-question practice test covers core EPA 608 topics for refrigerant certification. Topics include atmospheric layers, blended refrigerant fractionation, CFC refrigerant identification, technician certification rules, manifold gauge colors, heat flow, refrigeration cycle pressure components, AHRI 700 purity standard, Section 609 MVAC, system-dependent recovery, electronic leak detectors, recovery speed factors, evacuation hose sizing, recovery cylinder fill limits, and nitrogen pressure regulators. New questions cover azeotropic vs zeotropic blends, subcooling, superheat, EPA 608 exam structure, flash gas, receiver tanks, temperature glide, refrigerant scales, and compressor oil types.

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Type II Exam — What to Study (Most Important for HVAC Technicians)

Type II covers high-pressure systems and is the most commonly tested section for HVAC technicians. The questions cover:

  • Recovery methods: Push-pull, vapor recovery, liquid recovery — when to use each and why.
  • Recovery equipment: Self-contained vs. system-dependent recovery machines, oil separation, filter-drier change requirements.
  • Required vacuum levels: How deep a vacuum you must pull before opening a system depends on the refrigerant type and system size. Know EPA 40 CFR 82.156 recovery requirements.
  • Leak detection: Electronic detectors, UV dye, soap bubbles, nitrogen pressure testing. Know what is acceptable and when a system has an "excessive leak rate."
  • Charging practices: Weighing in refrigerant, using a manifold gauge set, superheat and subcooling — know what these values tell you about system charge.

Common Refrigerants — Properties You Need to Know

RefrigerantTypeODPGWPSafety ClassStatus
R-11CFC1.04,750A1Phased out
R-12CFC1.010,900A1Phased out
R-22HCFC0.0551,810A1Production ended 2020
R-134aHFC01,430A1Being phased down
R-404AHFC blend03,922A1Being phased down
R-410AHFC blend02,088A1Being phased down
R-32HFC0675A2LGrowing — R-410A replacement
R-454BHFO blend0466A2LR-410A replacement
R-744 (CO2)Natural01A1Growing in commercial

ODP = Ozone Depletion Potential. GWP = Global Warming Potential (CO₂ = 1). A2L = mildly flammable — requires special handling. Verify current values with EPA before the exam as regulations update.

EPA 608 Exam — FAQ

Where can I take the EPA 608 exam?

Through an EPA-approved testing organization such as ESCO Institute, HVAC Excellence, or Prometric. Many vocational schools, community colleges, and trade associations also offer the exam. Several providers offer online proctored testing from home.

Does the EPA 608 certification expire?

No. Once you pass, your certification does not expire. However, you are responsible for staying current with regulation changes (like the AIM Act phase-down schedule). A certification from 1995 is still valid, but the regulations it tested you on have changed.

Can I take just Type II and skip the others?

Yes. You can take any combination of the Core plus one or more type sections. Most residential and light commercial HVAC technicians need Core + Type II at minimum. Universal requires Core + Type I + Type II + Type III.

What is the difference between recovery and reclaim?

Recovery means removing refrigerant from a system into a recovery cylinder — the refrigerant may be contaminated and cannot be resold. Reclaim means processing recovered refrigerant back to virgin purity standards at an EPA-certified reclaim facility. Only reclaimed refrigerant can be resold or used in another customer's system.

Is R-22 still tested on the EPA 608 exam?

Yes. Even though R-22 production ended in 2020, existing equipment still runs on R-22. Technicians still service it using recovered or reclaimed R-22. The exam tests your knowledge of handling it safely and legally.

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