EPA 608 HVAC Certification Exam Prep – Real Practice Questions,
Answers & Detailed Rationales (Updated 2026) | Core,
Type I, Type II & Type III Coverage, Refrigerant Recovery &
Recycling, Leak Detection & Repair, System Evacuation &
Charging, Refrigeration Cycle Operations, EPA Regulations, Clean
Air Act Compliance & HVAC Safety
Question 1: What is the primary environmental concern addressed by EPA Section
608 of the Clean Air Act?
A. Reducing carbon dioxide emissions from HVAC systems
B. Preventing the release of ozone-depleting substances into the atmosphere
C. Improving energy efficiency of refrigeration equipment
D. Regulating the disposal of electronic HVAC components
CORRECT ANSWER: B. Preventing the release of ozone-depleting substances into
the atmosphere
Rationale: EPA Section 608 specifically targets the protection of stratospheric ozone by
regulating the handling, recovery, and disposal of refrigerants containing chlorine, such
as CFCs and HCFCs, which contribute to ozone depletion when released.
www.epa.gov
Question 2: Which refrigerant classification contains chlorine and has the highest
ozone depletion potential (ODP)?
A. HFC (Hydrofluorocarbon)
B. HCFC (Hydrochlorofluorocarbon)
C. CFC (Chlorofluorocarbon)
D. Natural refrigerants (ammonia, CO₂)
CORRECT ANSWER: C. CFC (Chlorofluorocarbon)
Rationale: CFCs contain chlorine atoms that, when released into the stratosphere,
catalyze the destruction of ozone molecules. CFCs have the highest ODP values (e.g.,
R-12 has an ODP of 1.0), making them the most damaging to the ozone layer among
common refrigerant classes.
www.epa.gov
Question 3: Under EPA Section 608, which certification type is required for
technicians servicing residential split-system air conditioners using R-410A?
A. Type I only
B. Type II only
C. Type III only
D. Universal certification
CORRECT ANSWER: B. Type II only
,Rationale: Type II certification covers high-pressure appliances, which include
residential and commercial air conditioning systems using refrigerants like R-410A, R-
22, and other high-pressure blends. R-410A operates at significantly higher pressures
than R-22 and falls under Type II equipment classification.
www.epa.gov
Question 4: What is the maximum allowable annual leak rate for comfort cooling
appliances containing more than 50 pounds of refrigerant before repairs are
mandated?
A. 5%
B. 10%
C. 15%
D. 35%
CORRECT ANSWER: C. 15%
Rationale: EPA regulations require that appliances other than commercial/industrial
process refrigeration containing more than 50 pounds of refrigerant must have leaks
repaired if the annual leak rate exceeds 15% of the total charge. Commercial/industrial
process refrigeration has a higher threshold of 35%.
www.epa.gov
Question 5: Which of the following is NOT a required component of proper
refrigerant recovery documentation?
A. Date of recovery
B. Type and quantity of refrigerant recovered
C. Technician's EPA certification number
D. Customer's social security number
CORRECT ANSWER: D. Customer's social security number
Rationale: EPA Section 608 requires documentation of refrigerant recovery including
date, refrigerant type, quantity recovered, and technician certification information.
Customer social security numbers are not required and would violate privacy
regulations.
www.epa.gov
Question 6: What is the minimum evacuation level required for a high-pressure
appliance containing less than 200 pounds of R-22 when using recovery equipment
manufactured after November 15, 1993?
A. 0 inches of Hg vacuum
B. 4 inches of Hg vacuum
C. 10 inches of Hg vacuum
D. 15 inches of Hg vacuum
,CORRECT ANSWER: B. 4 inches of Hg vacuum
Rationale: For high-pressure appliances containing less than 200 pounds of HCFC-22,
EPA regulations require evacuation to 4 inches of Hg vacuum when using recovery
equipment certified after November 15, 1993. Equipment manufactured before this
date had less stringent requirements.
www.hvactrainingsolutions.net
Question 7: Which safety precaution is MOST critical when working with
refrigerants in confined spaces?
A. Wearing insulated gloves only
B. Ensuring adequate ventilation to prevent oxygen displacement
C. Using only disposable refrigerant cylinders
D. Avoiding the use of electronic leak detectors
CORRECT ANSWER: B. Ensuring adequate ventilation to prevent oxygen
displacement
Rationale: Refrigerants are heavier than air and can displace oxygen in confined
spaces, creating a suffocation hazard. Proper ventilation and, in extreme cases, self-
contained breathing apparatus (SCBA) are essential safety measures when handling
refrigerants in enclosed areas.
www.hvactrainingsolutions.net
Question 8: What does the term "reclaim" specifically mean in EPA Section 608
terminology?
A. Removing refrigerant from a system and storing it in an external container
B. Cleaning refrigerant for immediate reuse by the same owner
C. Processing used refrigerant to meet AHRI 700 purity specifications for resale
D. Disposing of refrigerant in an environmentally approved manner
CORRECT ANSWER: C. Processing used refrigerant to meet AHRI 700 purity
specifications for resale
Rationale: "Reclaim" refers to reprocessing recovered refrigerant to new product
specifications as defined by AHRI Standard 700, which includes chemical analysis to
verify purity. This differs from "recover" (removal and storage) and "recycle" (cleaning for
same-owner reuse).
www.epa.gov
Question 9: Which refrigerant is classified as an HCFC and was commonly used in
residential air conditioning before phaseout?
A. R-12
B. R-22
, C. R-134a
D. R-410A
CORRECT ANSWER: B. R-22
Rationale: R-22 is a hydrochlorofluorocarbon (HCFC) refrigerant that was widely used
in residential and commercial air conditioning systems. It has an ozone depletion
potential of 0.05 and has been phased out of production in the United States under the
Clean Air Act, with limited exceptions for existing equipment.
www.epa.gov
Question 10: What is the primary purpose of installing both high-side and low-side
access valves when recovering refrigerant from a small appliance with an
inoperative compressor?
A. To allow for faster recovery by creating a pressure differential
B. To enable leak testing after recovery is complete
C. To ensure the required percentage of refrigerant can be recovered when the
compressor cannot assist
D. To facilitate oil removal during the recovery process
CORRECT ANSWER: C. To ensure the required percentage of refrigerant can be
recovered when the compressor cannot assist
Rationale: When a small appliance compressor is inoperative, passive recovery
methods rely on system pressure and temperature. Installing access valves on both
high and low sides maximizes refrigerant removal to meet the EPA requirement of
recovering 80% of the charge (or achieving 4 inches Hg vacuum).
www.hvactrainingsolutions.net
Question 11: Which of the following refrigerants is an HFC and does NOT contribute
to ozone depletion?
A. R-11
B. R-12
C. R-22
D. R-134a
CORRECT ANSWER: D. R-134a
Rationale: R-134a is a hydrofluorocarbon (HFC) refrigerant that contains no chlorine
atoms, giving it an ozone depletion potential (ODP) of zero. While HFCs do not harm the
ozone layer, many have high global warming potential (GWP) and are subject to
separate regulations.
www.epa.gov
Question 12: What is the required evacuation level for low-pressure appliances
using recovery equipment manufactured after November 15, 1993?
Answers & Detailed Rationales (Updated 2026) | Core,
Type I, Type II & Type III Coverage, Refrigerant Recovery &
Recycling, Leak Detection & Repair, System Evacuation &
Charging, Refrigeration Cycle Operations, EPA Regulations, Clean
Air Act Compliance & HVAC Safety
Question 1: What is the primary environmental concern addressed by EPA Section
608 of the Clean Air Act?
A. Reducing carbon dioxide emissions from HVAC systems
B. Preventing the release of ozone-depleting substances into the atmosphere
C. Improving energy efficiency of refrigeration equipment
D. Regulating the disposal of electronic HVAC components
CORRECT ANSWER: B. Preventing the release of ozone-depleting substances into
the atmosphere
Rationale: EPA Section 608 specifically targets the protection of stratospheric ozone by
regulating the handling, recovery, and disposal of refrigerants containing chlorine, such
as CFCs and HCFCs, which contribute to ozone depletion when released.
www.epa.gov
Question 2: Which refrigerant classification contains chlorine and has the highest
ozone depletion potential (ODP)?
A. HFC (Hydrofluorocarbon)
B. HCFC (Hydrochlorofluorocarbon)
C. CFC (Chlorofluorocarbon)
D. Natural refrigerants (ammonia, CO₂)
CORRECT ANSWER: C. CFC (Chlorofluorocarbon)
Rationale: CFCs contain chlorine atoms that, when released into the stratosphere,
catalyze the destruction of ozone molecules. CFCs have the highest ODP values (e.g.,
R-12 has an ODP of 1.0), making them the most damaging to the ozone layer among
common refrigerant classes.
www.epa.gov
Question 3: Under EPA Section 608, which certification type is required for
technicians servicing residential split-system air conditioners using R-410A?
A. Type I only
B. Type II only
C. Type III only
D. Universal certification
CORRECT ANSWER: B. Type II only
,Rationale: Type II certification covers high-pressure appliances, which include
residential and commercial air conditioning systems using refrigerants like R-410A, R-
22, and other high-pressure blends. R-410A operates at significantly higher pressures
than R-22 and falls under Type II equipment classification.
www.epa.gov
Question 4: What is the maximum allowable annual leak rate for comfort cooling
appliances containing more than 50 pounds of refrigerant before repairs are
mandated?
A. 5%
B. 10%
C. 15%
D. 35%
CORRECT ANSWER: C. 15%
Rationale: EPA regulations require that appliances other than commercial/industrial
process refrigeration containing more than 50 pounds of refrigerant must have leaks
repaired if the annual leak rate exceeds 15% of the total charge. Commercial/industrial
process refrigeration has a higher threshold of 35%.
www.epa.gov
Question 5: Which of the following is NOT a required component of proper
refrigerant recovery documentation?
A. Date of recovery
B. Type and quantity of refrigerant recovered
C. Technician's EPA certification number
D. Customer's social security number
CORRECT ANSWER: D. Customer's social security number
Rationale: EPA Section 608 requires documentation of refrigerant recovery including
date, refrigerant type, quantity recovered, and technician certification information.
Customer social security numbers are not required and would violate privacy
regulations.
www.epa.gov
Question 6: What is the minimum evacuation level required for a high-pressure
appliance containing less than 200 pounds of R-22 when using recovery equipment
manufactured after November 15, 1993?
A. 0 inches of Hg vacuum
B. 4 inches of Hg vacuum
C. 10 inches of Hg vacuum
D. 15 inches of Hg vacuum
,CORRECT ANSWER: B. 4 inches of Hg vacuum
Rationale: For high-pressure appliances containing less than 200 pounds of HCFC-22,
EPA regulations require evacuation to 4 inches of Hg vacuum when using recovery
equipment certified after November 15, 1993. Equipment manufactured before this
date had less stringent requirements.
www.hvactrainingsolutions.net
Question 7: Which safety precaution is MOST critical when working with
refrigerants in confined spaces?
A. Wearing insulated gloves only
B. Ensuring adequate ventilation to prevent oxygen displacement
C. Using only disposable refrigerant cylinders
D. Avoiding the use of electronic leak detectors
CORRECT ANSWER: B. Ensuring adequate ventilation to prevent oxygen
displacement
Rationale: Refrigerants are heavier than air and can displace oxygen in confined
spaces, creating a suffocation hazard. Proper ventilation and, in extreme cases, self-
contained breathing apparatus (SCBA) are essential safety measures when handling
refrigerants in enclosed areas.
www.hvactrainingsolutions.net
Question 8: What does the term "reclaim" specifically mean in EPA Section 608
terminology?
A. Removing refrigerant from a system and storing it in an external container
B. Cleaning refrigerant for immediate reuse by the same owner
C. Processing used refrigerant to meet AHRI 700 purity specifications for resale
D. Disposing of refrigerant in an environmentally approved manner
CORRECT ANSWER: C. Processing used refrigerant to meet AHRI 700 purity
specifications for resale
Rationale: "Reclaim" refers to reprocessing recovered refrigerant to new product
specifications as defined by AHRI Standard 700, which includes chemical analysis to
verify purity. This differs from "recover" (removal and storage) and "recycle" (cleaning for
same-owner reuse).
www.epa.gov
Question 9: Which refrigerant is classified as an HCFC and was commonly used in
residential air conditioning before phaseout?
A. R-12
B. R-22
, C. R-134a
D. R-410A
CORRECT ANSWER: B. R-22
Rationale: R-22 is a hydrochlorofluorocarbon (HCFC) refrigerant that was widely used
in residential and commercial air conditioning systems. It has an ozone depletion
potential of 0.05 and has been phased out of production in the United States under the
Clean Air Act, with limited exceptions for existing equipment.
www.epa.gov
Question 10: What is the primary purpose of installing both high-side and low-side
access valves when recovering refrigerant from a small appliance with an
inoperative compressor?
A. To allow for faster recovery by creating a pressure differential
B. To enable leak testing after recovery is complete
C. To ensure the required percentage of refrigerant can be recovered when the
compressor cannot assist
D. To facilitate oil removal during the recovery process
CORRECT ANSWER: C. To ensure the required percentage of refrigerant can be
recovered when the compressor cannot assist
Rationale: When a small appliance compressor is inoperative, passive recovery
methods rely on system pressure and temperature. Installing access valves on both
high and low sides maximizes refrigerant removal to meet the EPA requirement of
recovering 80% of the charge (or achieving 4 inches Hg vacuum).
www.hvactrainingsolutions.net
Question 11: Which of the following refrigerants is an HFC and does NOT contribute
to ozone depletion?
A. R-11
B. R-12
C. R-22
D. R-134a
CORRECT ANSWER: D. R-134a
Rationale: R-134a is a hydrofluorocarbon (HFC) refrigerant that contains no chlorine
atoms, giving it an ozone depletion potential (ODP) of zero. While HFCs do not harm the
ozone layer, many have high global warming potential (GWP) and are subject to
separate regulations.
www.epa.gov
Question 12: What is the required evacuation level for low-pressure appliances
using recovery equipment manufactured after November 15, 1993?
