HVAC Prep: EPA 608 Exam 2026
In-app purchases
Everyone
info
1+
Downloads
About this app
HVAC EPA 608 EXAM PREP: PASS YOUR CERTIFICATION ON THE FIRST TRY
Every HVAC technician working with refrigerants must hold an EPA 608 certification under Section 608 of the Clean Air Act. The exam has four sections โ Core, Type I, Type II, and Type III. You need to pass all four to earn your Universal certification. A passing score is 18 out of 25 correct on each section, graded independently.
Most technicians fail because they don't know which section is weak until they're in the testing center. This app tracks your score separately for each section so you know exactly where to focus before exam day.
REFRIGERANT CALCULATOR
The data the Core section tests every single time. Covers R-410A, R-22, R-32, R-134a, R-404A, and R-407C. For each refrigerant: ODP (ozone depletion potential), GWP (global warming potential), operating pressures, refrigerant type (HCFC, HFC, HFO), and phase-out status under the AIM Act and Montreal Protocol.
These values appear on the Core exam in almost every sitting. Most technicians memorize them wrong. This calculator gives you the correct values instantly and explains why they matter.
PRESSURE-TEMPERATURE REFERENCE
Instant P/T lookups for all common refrigerants. Enter a pressure, get the saturation temperature. Enter a temperature, get the pressure. Includes superheat and subcooling references for R-410A and R-22.
1,000+ PRACTICE QUESTIONS
Core: Ozone chemistry, Clean Air Act Section 608, refrigerant safety and handling, recovery requirements, leak detection, record keeping, sales restrictions, civil and criminal penalties.
Type I (small appliances, 5 lbs or less): Passive recovery, system-dependent recovery, disposable cylinder requirements, recovery efficiency standards.
Type II (high-pressure systems): Evacuation levels, recovery equipment certification, leak repair requirements for systems with 50+ lbs of refrigerant, low-loss fittings, pressure testing.
Type III (low-pressure systems, chillers): Deep vacuum requirements, purge unit operation, pressurization for leak testing with nitrogen, chiller-specific leak rates and repair timelines.
Universal: All four sections combined, weighted to match the actual exam distribution.
Every question tells you which section it covers, explains why the correct answer is right and why each wrong answer is wrong, and references the specific EPA regulation.
MOCK EXAM MODE
25 questions per section, timed, no explanations until complete. Get your pass/fail for each section separately โ exactly how the real exam scores it.
Free: 5 questions per day, refrigerant calculator for R-410A and R-22, Core section overview.
Monthly ($9.99): Unlimited questions, complete refrigerant calculator, P/T reference, mock exam, per-section tracking, 3-day free trial.
Annual ($49.99): Everything monthly. Save over 55 percent. Best value.
Lifetime ($49.99): One payment. Permanent access.
PASS PROMISE: Complete all questions with 80% or higher average, hold active subscription for 3 months, still do not pass. We extend your access by 4 months at no charge. voltexam.com/pass-promise
Not affiliated with the EPA or any authorized testing organization. This is an independent study tool.
Privacy Policy: https://www.voltexam.com/privacy
Terms of Service: https://www.voltexam.com/terms
Every HVAC technician working with refrigerants must hold an EPA 608 certification under Section 608 of the Clean Air Act. The exam has four sections โ Core, Type I, Type II, and Type III. You need to pass all four to earn your Universal certification. A passing score is 18 out of 25 correct on each section, graded independently.
Most technicians fail because they don't know which section is weak until they're in the testing center. This app tracks your score separately for each section so you know exactly where to focus before exam day.
REFRIGERANT CALCULATOR
The data the Core section tests every single time. Covers R-410A, R-22, R-32, R-134a, R-404A, and R-407C. For each refrigerant: ODP (ozone depletion potential), GWP (global warming potential), operating pressures, refrigerant type (HCFC, HFC, HFO), and phase-out status under the AIM Act and Montreal Protocol.
These values appear on the Core exam in almost every sitting. Most technicians memorize them wrong. This calculator gives you the correct values instantly and explains why they matter.
PRESSURE-TEMPERATURE REFERENCE
Instant P/T lookups for all common refrigerants. Enter a pressure, get the saturation temperature. Enter a temperature, get the pressure. Includes superheat and subcooling references for R-410A and R-22.
1,000+ PRACTICE QUESTIONS
Core: Ozone chemistry, Clean Air Act Section 608, refrigerant safety and handling, recovery requirements, leak detection, record keeping, sales restrictions, civil and criminal penalties.
Type I (small appliances, 5 lbs or less): Passive recovery, system-dependent recovery, disposable cylinder requirements, recovery efficiency standards.
Type II (high-pressure systems): Evacuation levels, recovery equipment certification, leak repair requirements for systems with 50+ lbs of refrigerant, low-loss fittings, pressure testing.
Type III (low-pressure systems, chillers): Deep vacuum requirements, purge unit operation, pressurization for leak testing with nitrogen, chiller-specific leak rates and repair timelines.
Universal: All four sections combined, weighted to match the actual exam distribution.
Every question tells you which section it covers, explains why the correct answer is right and why each wrong answer is wrong, and references the specific EPA regulation.
MOCK EXAM MODE
25 questions per section, timed, no explanations until complete. Get your pass/fail for each section separately โ exactly how the real exam scores it.
Free: 5 questions per day, refrigerant calculator for R-410A and R-22, Core section overview.
Monthly ($9.99): Unlimited questions, complete refrigerant calculator, P/T reference, mock exam, per-section tracking, 3-day free trial.
Annual ($49.99): Everything monthly. Save over 55 percent. Best value.
Lifetime ($49.99): One payment. Permanent access.
PASS PROMISE: Complete all questions with 80% or higher average, hold active subscription for 3 months, still do not pass. We extend your access by 4 months at no charge. voltexam.com/pass-promise
Not affiliated with the EPA or any authorized testing organization. This is an independent study tool.
Privacy Policy: https://www.voltexam.com/privacy
Terms of Service: https://www.voltexam.com/terms
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Whatโs new
- Improved premium UI spacing and screen polish
- Added EPA 608 practice questions with explanations and references
- Added mock exam, flashcards, bookmarks, and progress tracking
- Added HVAC tools for P/T chart, superheat, subcooling, CFM/BTU, diagnostics, and safety review
- Added EPA 608 practice questions with explanations and references
- Added mock exam, flashcards, bookmarks, and progress tracking
- Added HVAC tools for P/T chart, superheat, subcooling, CFM/BTU, diagnostics, and safety review
App support
phone
Phone number
+16475702428
About the developer
Deeun Inc
arun@voltexam.com
325 Webb Dr
Mississauga, ON L5B 3Z9
Canada
+1 647-570-2428
