The complete HVAC exam prep guide
Your Roadmap to HVAC Exam Success.
From your first free practice set to exam-day simulations — clear, screenshot-led guides to EPA 608 and NATE, with real questions and explanations at every step.
- 1,500+
- practice questions
- 4
- exam paths
- 15
- free questions / module
Choose your path
Four guides. Start with the one that matches your goal.
Not sure which exam is yours? The practice test hub compares every path side by side.
EPA 608 Certification
What the federal credential is, who legally needs it, and how Core, Type I, Type II, Type III and Universal differ — before you pick an exam.
- It never expires
- Proctor rules per type
- Cost and test locations
EPA 608 Practice Test
Free practice questions for Core, Type I, II & III with explanations, the most common exam traps, and a complete 14-day study sequence.
- Section-by-section focus
- 2026 leak-rate updates
- Free study PDF
NATE Core Practice Test
Topic coverage, free sample questions and a study plan for the 50-question Core exam — plus when to move into specialty prep.
- Six Core topic areas
- Six sample questions
- Specialty next steps
All Practice Tests
Compare EPA 608, NATE, and journeyman or master-license paths in one place, try sample questions, then start the prep that fits your goal.
- Path comparison table
- 7-day & 30-day plans
- Free sample questions
Quick answer
What does the EPA 608 exam look like?
Full certification guide100
multiple-choice questions
Divided into Core, Type I, II and III.
4
independent sections
25 questions in Core and in each type.
70%
to pass each section
18 out of 25 correct, scored separately.
Universal
the card most techs want
Pass Core plus all three types.
Inside the app
From first answer to focused review.
Every question gives immediate feedback, then scales the depth of the review to your access level.
Each question shows four options, progress and a bookmark star.
Correct turns green. Wrong turns red while the right option is highlighted.
Free access shows the correct answer but locks the full reasoning.
Standard and Ultimate unlock the detailed explanation and reference.
The study plan
A 14-day sequence to your Universal card.
Commit to 30–45 minutes a day and you can pass in two weeks. The full breakdown — with the hardest topics per section and the mistakes to avoid — is in the practice test guide.
Days 1–3
Core focus
Read the Core guide, take three Core practice tests, and don't move on until you consistently score over 85%.
Days 4–5
Type I focus
Review small-appliance recovery rules and drill the trap questions on recovery equipment.
Days 6–8
Type II focus
The hardest section for most. Memorize the 2026 high-pressure leak-rate thresholds and drill hard.
Days 9–10
Type III focus
Low-pressure chiller operations — leak testing and purge units, even if you never touch a chiller.
Days 11–13
Full simulations
Three complete 100-question mock exams, timed at two hours to mirror the real environment.
Day 14
Rest & review
Flashcards for dates and numbers only. Then go pass your exam.
NATE Core
The Core exam everything else builds on.
For the Professional NATE path, every candidate passes the 50-question Core exam before a specialty. The practice test guide covers the six topic areas the exam rewards — and the mistakes that cost prepared technicians points.
Safety
Lockout procedures, personal protection and safe work habits.
Tools & measurements
Meter use, pressure logic and confirming field conditions.
Electrical basics
Core circuit logic, components, switches and troubleshooting.
Heat transfer
Thermodynamics, sensible vs latent heat and airflow.
Construction & comfort
Ventilation basics, comfort expectations, system thinking.
Soft skills
Customer communication and careful question reading.
Try one right now
Free sample question — no account needed.
Refrigeration
Which refrigerant is an HFO with a low Global Warming Potential (GWP)?
What's free & what's not
Start free. Upgrade only when you're ready.
| Feature | FreeGuest | Standard$14.99 one-time | Ultimate$29.99 one-time |
|---|---|---|---|
| Practice questions | First 15 per sub-module | Full EPA + NATE bank | Full EPA + NATE bank |
| Answer explanations | Correct answer only | Full explanations | Full explanations |
| AI diagnostic | First 15 questions | Stays active | Stays active |
| Simulated exams | — | — | Unlimited mocks |
| PDF library | — | — | 5–10 downloads |
Standard owners upgrade to Ultimate for only the $15 difference — never $29.99 again.
Quick FAQ
Answers at a glance.
Yes. Every guide and sample question is free with no account required, and the web app gives you free practice sessions for EPA 608 Core, NATE Core and general HVAC topics. The full 1,500+ question bank with AI-powered weak-spot analysis comes with a one-time purchase.
You're ready
Turn the guide into your first score.
Open HVAC Exam Master, answer 15 questions, and get your baseline — then use the guide that matches your path.