EPA 608 Core Questions: What to Expect (2026)
EPA 608 Core has 25 questions across 9 topics. See the topic breakdown, 8 must-know facts, sample questions with answers, and how Core connects to all types.
What are the EPA 608 Core questions actually about? The Core section has 25 multiple-choice questions covering ozone science, the Clean Air Act, refrigerant recovery rules, and safety. It is the mandatory section that every certification type requires — pass Core, and you have the foundation for Type I, II, III, and Universal. This guide breaks down every EPA 608 Core question topic, the exact facts that appear on every exam, and sample questions with explained answers.
TL;DR — EPA 608 Core Questions
The Core has 25 questions across 9 topics. Highest-weight topics: environmental impact (ODP/GWP), Clean Air Act regulations, and the 3 Rs (recover/recycle/reclaim). You need 18/25 (72%) to pass. Key numbers to memorize: $44,539 fine, 500 microns evacuation, 80% cylinder fill limit, chlorine destroys ozone. Study these EPA 608 Core questions and you cover 80% of the exam.
What Is on the EPA 608 Core Exam?
The EPA 608 Core questions cover the foundational knowledge every refrigerant technician must have. Unlike Type I, II, and III — which focus on specific equipment — the Core tests regulations, environmental science, and safety that apply universally. The EPA organizes Core content into 9 topic areas:
TOPIC BREAKDOWN
9 Topics on the EPA 608 Core Exam (25 Questions)
💡 Chlorine → ozone destruction. CFC worst, HCFC moderate, HFC = 0 ODP.
💡 Phaseout dates, venting prohibition, $44,539/day fine.
💡 Appliance definition, sales restrictions, recovery requirements.
💡 No 'drop-in' for R-22. POE vs mineral oil. Compatibility.
💡 Vapor vs liquid. Pressures at different points of the cycle.
💡 Recover = remove. Recycle = basic cleaning. Reclaim = new product specs.
💡 Never mix refrigerants. Recovery speed factors.
💡 500 microns minimum. Remove air and moisture before charging.
💡 Cylinders: never fill >80%. DOT labeling. R-410A high pressure.
8 Facts That Appear on Every Core Exam
These 8 facts show up as EPA 608 Core questions on virtually every exam. Memorize them and you guarantee yourself 8 correct answers out of 25 — that is already 32% of the passing score locked in before you even study the other topics.
8 FACTS THAT ALWAYS APPEAR
Memorize These 8 Core Facts — They Appear on Every Exam
Chlorine in CFC/HCFC destroys ozone. 1 chlorine atom = 100,000 ozone molecules destroyed.
$44,539 per day per violation of the Clean Air Act (including intentional venting).
1987 international treaty. Nearly 200 nations. Phased out CFC and HCFC.
Recover (remove from system) ≠ Recycle (basic cleaning) ≠ Reclaim (chemical analysis, like-new specs).
500 microns = minimum evacuation level for most systems before charging.
Never fill a recovery cylinder more than 80% capacity. Explosion risk.
HCFC, ODP 0.055, production banned 2020. Only recycled/reclaimed available.
Intentionally releasing refrigerant is ILLEGAL (except de minimis amounts during repair).
Sample EPA 608 Core Questions (With Answers)
Here are 5 real-style EPA 608 Core questions with the correct answers and explanations for why each answer is right. These represent the types of questions you will see on exam day:
SAMPLE QUESTIONS
5 Real EPA 608 Core Questions
❓ What element in CFC and HCFC refrigerants causes ozone depletion?
→ Chlorine
💡 CFC = Chloro-Fluoro-Carbon. CHLORINE is what destroys ozone.
❓ What is the maximum fine per day for violating the Clean Air Act?
→ $44,539
💡 This exact number appears on EVERY exam. Memorize it.
❓ What is the difference between recycling and reclaiming refrigerant?
→ Recycle = basic field cleaning. Reclaim = lab processing to new-product specifications.
💡 The recover/recycle/reclaim distinction appears in 2-3 Core questions.
❓ To what vacuum level should most systems be evacuated before charging?
→ 500 microns
💡 This is the minimum evacuation standard. Different from Type II and III specific levels.
❓ What is the maximum percentage of capacity a recovery cylinder can be filled to?
→ 80%
💡 Safety: filling above 80% = hydrostatic rupture risk from thermal expansion.
Want more practice? Our Core practice test has 25 questions that simulate the real exam format. Take it under timed conditions (30 minutes) to replicate exam pressure.
How Core Connects to the Other Sections
Understanding EPA 608 Core questions is not just about passing Core — it is about building the foundation for every other section. Core knowledge applies directly to Type I, II, and III questions:
CORE VS OTHER SECTIONS
How Core Connects to Type I, II, and III
Laws, environment, safety, regulations
Foundation for ALL other sections
Small appliances ≤5 lbs
Applies Core knowledge to household appliances
High pressure systems, residential/commercial AC
Leak rates (Core rules) + specific pressures
Low pressure systems, chillers
Safety (Core) + specific 25 mm Hg evacuation
This is why the most efficient study order is: Core first, then Type I (easiest), then Type III, then Type II (hardest). Core concepts make the other sections easier because you already understand the regulatory framework. See our study time guide for a complete 14-day plan.
Core Study Strategy: How to Prepare
The most effective approach to EPA 608 Core questions combines three methods:
- Read the study guide Core section — Understand the concepts first. Focus on ODP vs GWP, the 3 Rs, and Clean Air Act basics. Time: 2–4 hours.
- Drill with flashcards — Memorize the specific numbers ($44,539, 500 microns, 80%). These are pure recall questions. Time: 1–2 hours.
- Take the Core practice test until you score 85%+ — If you consistently hit 85% on practice, you will pass the real exam. Time: 30 min per attempt.
Frequently Asked Questions
How many questions are on the EPA 608 Core exam?
The EPA 608 Core has 25 multiple-choice questions. You need 18 correct (72%) to pass. The questions cover 9 topic areas from ozone science to safety and shipping regulations.
Is the EPA 608 Core section hard?
The Core is moderate difficulty — harder than Type I but easier than Type II. The EPA 608 Core questions test memorization (dates, numbers, definitions) rather than complex problem-solving. With 2–4 hours of focused study, most people pass on the first attempt.
Do I need to pass Core for every EPA 608 type?
Yes. Core is mandatory for all certification types — Type I, II, III, and Universal. Every EPA 608 candidate must pass Core. If you take the Universal exam, Core is one of your four sections (25 of 100 questions).
What topics do EPA 608 Core questions cover?
EPA 608 Core questions cover 9 topics: environmental impact (ODP/GWP), Clean Air Act, Montreal Protocol, Section 608 regulations, substitute refrigerants, refrigeration cycle, recovery/recycling/reclaiming, dehydration/evacuation, and safety/shipping.
What is the hardest topic on the EPA 608 Core?
Dehydration/evacuation is the most commonly missed Core topic. The 500-micron evacuation level and the difference between evacuation requirements for different system sizes are frequent EPA 608 Core questions that people miss. Substitute refrigerants and oil compatibility are also tricky.
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Practice Core Questions Now
25 Core questions, timed, same format as the real exam. See exactly which of the 9 topics you need to study more.