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Select your certification level and start practicing immediately. All tests include instant scoring and detailed explanations.
Essential knowledge for all technicians working with refrigerants
Small appliances like household refrigerators and window AC units
High-pressure appliances like commercial refrigeration systems
Low-pressure appliances like centrifugal chillers
Complete certification covering Core + all three Types
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Whether you’re an experienced HVAC service technician, a student in training, or just stepping into the industry, our platform is built to help you succeed.
No account creation, no forms, no delays. Click and start practicing immediately. Your time is valuable.
All your results stay on your device with bank-level security. We don't collect any personal data. Your privacy is completely protected.
Track every test attempt with detailed analytics, progress trends, and performance insights. See your improvement journey unfold over time.
Practice on your phone during breaks, tablet at home, or computer at work. Fully responsive design.
Practice with questions that match the real EPA 608 exam — built from actual 2023 and 2024 test content.
No hidden fees, no premium upgrades, no tricks. We believe certification preparation should be accessible to everyone.
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Advanced AI-powered features that adapt to your learning style and focus on your weak spots
Our AI automatically identifies your weakest areas and creates custom mini-tests targeting exactly what you need to improve.
Watch your skills improve in real-time during tests with live accuracy tracking and instant weak-spot identification.
Never forget a mistake again. Our system tracks every wrong answer and lets you review them until you master each concept.
Deep insights into your performance with detailed breakdowns by topic, difficulty, and improvement trends over time.
Every test attempt saved with detailed timestamps, scores, and improvement tracking. See your learning journey unfold.
Get personalized study suggestions after every test. Our AI tells you exactly what to focus on next for maximum improvement.
Real feedback from HVAC technicians who used our practice tests
Passed Universal on my first try! The questions were spot-on with the actual exam. The instant feedback helped me understand concepts I was struggling with.
— Mike, Commercial HVAC Tech, PhoenixI was nervous about the exam, but this gave me confidence. Practiced during lunch breaks and felt completely prepared on test day. Highly recommend!
— Sarah, Residential Technician, DallasLove that it's completely free and works on my phone. No signup hassle, just pure practice. Scored 94% on the real exam thanks to this site.
— Carlos, Industrial Refrigeration, MiamiStart tracking your improvement instantly
Everything you need to know about the EPA 608 test and certification
The EPA 608 test is a certification exam required under the Federal Clean Air Act for HVAC professionals and trainees. Our practice test helps you prepare by simulating the types of questions you'll see on the actual exam.
There are four categories:
Passing all three types earns you the Universal Certification.
The ESCO Institute administers the official EPA 608 exam and related study materials. Many online platforms, including ours, offer free practice exams to help you prepare.
Yes — all of our practice exams are completely free.
Our practice exams include questions on refrigerant recovery, handling, and system safety, along with topics like the HCFC phase-out and pressure–temperature charts. They're designed to prepare you for every section of the real exam.
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