CORE
Required for everyoneCore Section
Ozone depletion science, Clean Air Act regulations, recovery procedures, and refrigerant safety fundamentals.
Study Core Section
2026 Edition · Updated for current rules
Pass the EPA 608 the first time.
The federal refrigerant-handling certification mandated by the Clean Air Act — broken down into Core, Type I, II, III, and Universal. Built for technicians who want a clear study path, not a question dump.
- Sections
- 4
- To pass
- 18/25
- Validity
- Life
§ 01 — The Four Sections
Pick the certification that matches your work.
Pass all four for Universal Certification. Or pass Core plus the single Type that covers the equipment you service.
I
Small Appliances ≤ 5 lbsType I
Domestic refrigerators, freezers, window AC units, PTACs, vending machines, and water coolers.
Study Type I
II
High-Pressure AppliancesType II
Residential & commercial split systems, heat pumps, supermarket racks. The standard for residential HVAC techs.
Study Type II
III
Low-Pressure AppliancesType III
Industrial centrifugal chillers operating below atmospheric pressure. Specialized commercial work.
Study Type III
★
Master Practice Test — All Sections
The hardest Core, Type I, II, and III questions in one guided EPA 608 prep run.
§ 02 — Exam Format
Four sections. One hundred questions. Closed book.
The exam is proctored and split into independent sections. Pass them in any combination — your certification scales with what you complete.
- 25Questions per sectionIndependent scoring per section.
- 18/25To pass72% threshold required for each section.
- 4Sections totalCore, Type I, Type II, Type III.
- ∞Valid for lifeNo renewal fees, no continuing education.
!
Fastest way to pass
Study Core first, then your relevant Type, then run a full-length practice test. Most failures come from skipping straight to question banks before learning the structure.
§ 03 — Critical Memorization
Leak rate thresholds. Memorize these — or fail.
One of the most failed topics on the exam. Updated rates effective 2019 still apply. If a leak exceeds the threshold for the appliance class, repair is mandated within a fixed window.
Appliance Type
Trigger Rate
Industrial Process Refrigeration
30%
Commercial Refrigeration
20%
Comfort Cooling (Residential & Commercial)
10%
* Annualized leak rate. Owners must repair leaks exceeding these thresholds within 30 days of discovery.
§ 04 — Study Plan
The three-step plan first-time test takers actually follow.
Skip the random-question-dump trap. Work overview → section → simulated practice.
- STEP 01
Learn the structure
Understand how Core, Type I, II, III, and Universal differ before memorizing details. Pick the path that matches your work.
01 - STEP 02
Study one section at a time
Focus on regulations, appliance categories, and recovery rules section by section — never mix topics too early.
02 - STEP 03
Simulate the real exam
Run timed full-length practice tests last to build speed, pattern recognition, and exam-day confidence.
03
Mandatory · Federal Law
EPA 608
Environmental and refrigerant-handling certification under the Clean Air Act. You cannot legally service sealed HVACR systems without it.
- ✓ Required by law
- ✓ Focuses on safety & environment
- ✓ Lifetime validity
Voluntary · Industry Badge
NATE
Optional credential proving technical competency in diagnostics, wiring, and airflow. Often correlates with higher pay and better job offers.
- ✓ Demonstrates skill mastery
- ✓ Optional but career-boosting
- ✓ Renewal required
§ 05 — FAQ
Common questions, answered straight.
Still unsure? The certification path depends entirely on the equipment you plan to service.
Is the EPA 608 exam open book?
Generally no. Core, Type II, and Type III are closed book. Type I may be open book depending on the proctor.
How many questions are on the exam?
100 total — 25 questions per section. You need at least 18 out of 25 correct to pass each section.
Who legally needs EPA 608?
Any technician who maintains, services, repairs, or disposes of appliances containing regulated refrigerants.
Does the certification expire?
No. EPA 608 certification is valid for life. There are no renewal fees or continuing education requirements.
How much does the exam cost?
Pricing varies by approved provider and proctor. Expect a separate exam fee unless bundled with a training program.
Can I work on automotive A/C with EPA 608?
No. Motor vehicle A/C work requires a separate Section 609 certification under the Clean Air Act.
Ready to start your EPA 608 study plan?
Use the certification guide as your roadmap. When you're consistently passing practice tests, book the proctored exam.