EPA 608 HVAC Certification | EPA Section 608
Technician Certification Study Guide & Exam Prep
2026/2027 | HVAC Refrigerant Handling, EPA 608
Core, Type I, Type II & Type III, Universal
Certification, Ozone Protection, Refrigerant
Recovery & Recycling, Leak Detection, Refrigerant
Management, Service Practices, Refrigeration & Air
Conditioning, Recovery Equipment, EPA
Regulations, Practice Questions, Answers &
Detailed Rationales
Question 1: According to EPA Section 608 regulations, what is the maximum
allowable annual leak rate for a comfort cooling appliance containing an
ozone-depleting refrigerant?
A. 5% per year
B. 10% per year
C. 15% per year
D. 20% per year
CORRECT ANSWER: B. 10% per year
Rationale: Under EPA regulations, comfort cooling appliances containing ozone-
depleting refrigerants must be repaired when the annual leak rate exceeds 10%. This
threshold was updated from the previous 15% standard. The 10% trigger requires
technicians to identify and repair leaks promptly to minimize environmental harm and
ensure compliance with Section 608 of the Clean Air Act.
Question 2: Which certification type permits a technician to service small
appliances containing five pounds or less of refrigerant?
A. Type I
B. Type II
C. Type III
D. Universal
CORRECT ANSWER: A. Type I
Rationale: Type I certification is specifically designed for technicians who service small
appliances, defined as hermetically sealed units manufactured with five pounds or less
of refrigerant. Examples include household refrigerators, window air conditioners,
dehumidifiers, and vending machines. Type II covers high-pressure appliances, Type III
covers low-pressure appliances, and Universal covers all equipment types.
Question 3: When is a certified technician permitted to use an open-book
format for the EPA Section 608 exam?
,A. Type II and Type III only
B. Type I and Core only
C. Universal certification only
D. All exam types permit open-book
CORRECT ANSWER: B. Type I and Core only
Rationale: The EPA allows open-book testing only for the Core and Type I sections of
the exam. Type II and Type III exams are strictly closed-book. To pass the Core section
in an open-book format, the technician must correctly answer 21 out of 25 questions
(84%), whereas a closed-book exam requires 18 out of 25 (72%).
Question 4: What is the primary environmental concern that led to the
creation of EPA Section 608 regulations?
A. Global warming from carbon dioxide emissions
B. Ozone depletion caused by chlorofluorocarbons (CFCs) and
hydrochlorofluorocarbons (HCFCs)
C. Water contamination from refrigerant disposal
D. Air pollution from combustion processes
CORRECT ANSWER: B. Ozone depletion caused by chlorofluorocarbons (CFCs)
and hydrochlorofluorocarbons (HCFCs)
Rationale: Section 608 of the Clean Air Act was established to protect the stratospheric
ozone layer from depletion by ozone-depleting substances (ODS). CFCs and HCFCs,
commonly used as refrigerants, release chlorine atoms when they reach the upper
atmosphere, which catalyze ozone destruction. This environmental damage increases
harmful UV radiation reaching Earth's surface.
Question 5: What is the minimum passing score required for a closed-book EPA
Section 608 exam section?
A. 70%
B. 72%
C. 75%
D. 80%
CORRECT ANSWER: B. 72%
Rationale: For closed-book exam sections (Type II, Type III, and Core when taken
closed-book), a technician must correctly answer 18 out of 25 questions, representing a
passing score of 72%. The open-book format for Core and Type I requires a higher
threshold of 84% (21 out of 25 correct).
Question 6: According to EPA regulations, what is the definition of "recovery"
as applied to refrigerants?
A. The process of cleaning refrigerant for reuse in any system
B. The process of removing refrigerant from a system and storing it in an external
,container
C. The process of chemically analyzing refrigerant purity
D. The process of destroying refrigerant to eliminate environmental impact
CORRECT ANSWER: B. The process of removing refrigerant from a system and
storing it in an external container
Rationale: Recovery is specifically defined as the removal of refrigerant from a system
and its storage in an external container, typically a recovery cylinder. The key distinction
is that recovered refrigerant may not be cleaned or processed. Recycling involves
cleaning for reuse, while reclaiming involves chemical analysis and processing to meet
purity standards.
Question 7: Which type of certification is required to service high-pressure and
very high-pressure appliances?
A. Type I
B. Type II
C. Type III
D. Type IV
CORRECT ANSWER: B. Type II
Rationale: Type II certification is designated for technicians who service, maintain, or
dispose of high-pressure and very high-pressure appliances. This category includes
residential and commercial air conditioning systems, heat pumps, and commercial
refrigeration equipment. Examples of refrigerants in this category include R-22, R-410A,
R-404A, and R-134a.
Question 8: A technician working on a low-pressure chiller system would
require which EPA certification?
A. Type I
B. Type II
C. Type III
D. Universal
CORRECT ANSWER: C. Type III
Rationale: Type III certification is specifically for technicians servicing or disposing of
low-pressure appliances, which typically include large centrifugal chillers. These systems
operate below atmospheric pressure and commonly use refrigerants such as R-11, R-
123, R-245fa, or R-1233zd. Low-pressure systems present unique challenges including
air infiltration and special safety requirements due to the toxicity of some low-pressure
refrigerants.
Question 9: What is the primary difference between "recycling" and
"reclaiming" refrigerant?
, A. Recycling removes contaminants, while reclaiming only filters particulates
B. Recycling is performed on-site for reuse in the same system, while reclaiming involves
off-site processing to ARI Standard 700 purity
C. Recycling can only be done on small appliances, while reclaiming is for large systems
D. There is no meaningful difference between the two terms
CORRECT ANSWER: B. Recycling is performed on-site for reuse in the same
system, while reclaiming involves off-site processing to ARI Standard 700
purity
Rationale: Recycling involves cleaning refrigerant on-site using specialized equipment to
remove contaminants such as oil, moisture, and acids, allowing the refrigerant to be
returned to the same system. Reclaiming is a more rigorous process performed at an off-
site facility that chemically analyzes and processes refrigerant to meet ARI Standard 700
purity specifications, ensuring it is equivalent to new product.
Question 10: When servicing a system after opening it for repair, what is the
purpose of performing a deep vacuum?
A. To remove non-condensable gases and moisture from the system
B. To test the system's pressure rating
C. To verify the amount of refrigerant remaining in the system
D. To check for electrical insulation resistance
CORRECT ANSWER: A. To remove non-condensable gases and moisture from
the system
Rationale: A deep vacuum is performed to remove moisture and non-condensable gases
(such as air) from a refrigeration system after it has been opened for service. Moisture
can cause acid formation and compressor failure, while non-condensable gases reduce
system efficiency and increase operating pressures. The specific vacuum level required
depends on the refrigerant type and system characteristics.
Question 11: Who is required to hold EPA Section 608 certification?
A. Only technicians who install new HVAC equipment
B. Any person who maintains, services, repairs, or disposes of appliances containing
ozone-depleting refrigerants
C. Only technicians working in commercial refrigeration
D. Only the lead technician on a service call
CORRECT ANSWER: B. Any person who maintains, services, repairs, or
disposes of appliances containing ozone-depleting refrigerants
Rationale: Section 608 of the Clean Air Act mandates that all individuals who maintain,
service, repair, or dispose of appliances that contain ozone-depleting refrigerants must
be certified in proper refrigerant handling techniques. This includes technicians,
apprentices, and anyone else performing these activities, not just those in specific roles
or equipment categories.
Technician Certification Study Guide & Exam Prep
2026/2027 | HVAC Refrigerant Handling, EPA 608
Core, Type I, Type II & Type III, Universal
Certification, Ozone Protection, Refrigerant
Recovery & Recycling, Leak Detection, Refrigerant
Management, Service Practices, Refrigeration & Air
Conditioning, Recovery Equipment, EPA
Regulations, Practice Questions, Answers &
Detailed Rationales
Question 1: According to EPA Section 608 regulations, what is the maximum
allowable annual leak rate for a comfort cooling appliance containing an
ozone-depleting refrigerant?
A. 5% per year
B. 10% per year
C. 15% per year
D. 20% per year
CORRECT ANSWER: B. 10% per year
Rationale: Under EPA regulations, comfort cooling appliances containing ozone-
depleting refrigerants must be repaired when the annual leak rate exceeds 10%. This
threshold was updated from the previous 15% standard. The 10% trigger requires
technicians to identify and repair leaks promptly to minimize environmental harm and
ensure compliance with Section 608 of the Clean Air Act.
Question 2: Which certification type permits a technician to service small
appliances containing five pounds or less of refrigerant?
A. Type I
B. Type II
C. Type III
D. Universal
CORRECT ANSWER: A. Type I
Rationale: Type I certification is specifically designed for technicians who service small
appliances, defined as hermetically sealed units manufactured with five pounds or less
of refrigerant. Examples include household refrigerators, window air conditioners,
dehumidifiers, and vending machines. Type II covers high-pressure appliances, Type III
covers low-pressure appliances, and Universal covers all equipment types.
Question 3: When is a certified technician permitted to use an open-book
format for the EPA Section 608 exam?
,A. Type II and Type III only
B. Type I and Core only
C. Universal certification only
D. All exam types permit open-book
CORRECT ANSWER: B. Type I and Core only
Rationale: The EPA allows open-book testing only for the Core and Type I sections of
the exam. Type II and Type III exams are strictly closed-book. To pass the Core section
in an open-book format, the technician must correctly answer 21 out of 25 questions
(84%), whereas a closed-book exam requires 18 out of 25 (72%).
Question 4: What is the primary environmental concern that led to the
creation of EPA Section 608 regulations?
A. Global warming from carbon dioxide emissions
B. Ozone depletion caused by chlorofluorocarbons (CFCs) and
hydrochlorofluorocarbons (HCFCs)
C. Water contamination from refrigerant disposal
D. Air pollution from combustion processes
CORRECT ANSWER: B. Ozone depletion caused by chlorofluorocarbons (CFCs)
and hydrochlorofluorocarbons (HCFCs)
Rationale: Section 608 of the Clean Air Act was established to protect the stratospheric
ozone layer from depletion by ozone-depleting substances (ODS). CFCs and HCFCs,
commonly used as refrigerants, release chlorine atoms when they reach the upper
atmosphere, which catalyze ozone destruction. This environmental damage increases
harmful UV radiation reaching Earth's surface.
Question 5: What is the minimum passing score required for a closed-book EPA
Section 608 exam section?
A. 70%
B. 72%
C. 75%
D. 80%
CORRECT ANSWER: B. 72%
Rationale: For closed-book exam sections (Type II, Type III, and Core when taken
closed-book), a technician must correctly answer 18 out of 25 questions, representing a
passing score of 72%. The open-book format for Core and Type I requires a higher
threshold of 84% (21 out of 25 correct).
Question 6: According to EPA regulations, what is the definition of "recovery"
as applied to refrigerants?
A. The process of cleaning refrigerant for reuse in any system
B. The process of removing refrigerant from a system and storing it in an external
,container
C. The process of chemically analyzing refrigerant purity
D. The process of destroying refrigerant to eliminate environmental impact
CORRECT ANSWER: B. The process of removing refrigerant from a system and
storing it in an external container
Rationale: Recovery is specifically defined as the removal of refrigerant from a system
and its storage in an external container, typically a recovery cylinder. The key distinction
is that recovered refrigerant may not be cleaned or processed. Recycling involves
cleaning for reuse, while reclaiming involves chemical analysis and processing to meet
purity standards.
Question 7: Which type of certification is required to service high-pressure and
very high-pressure appliances?
A. Type I
B. Type II
C. Type III
D. Type IV
CORRECT ANSWER: B. Type II
Rationale: Type II certification is designated for technicians who service, maintain, or
dispose of high-pressure and very high-pressure appliances. This category includes
residential and commercial air conditioning systems, heat pumps, and commercial
refrigeration equipment. Examples of refrigerants in this category include R-22, R-410A,
R-404A, and R-134a.
Question 8: A technician working on a low-pressure chiller system would
require which EPA certification?
A. Type I
B. Type II
C. Type III
D. Universal
CORRECT ANSWER: C. Type III
Rationale: Type III certification is specifically for technicians servicing or disposing of
low-pressure appliances, which typically include large centrifugal chillers. These systems
operate below atmospheric pressure and commonly use refrigerants such as R-11, R-
123, R-245fa, or R-1233zd. Low-pressure systems present unique challenges including
air infiltration and special safety requirements due to the toxicity of some low-pressure
refrigerants.
Question 9: What is the primary difference between "recycling" and
"reclaiming" refrigerant?
, A. Recycling removes contaminants, while reclaiming only filters particulates
B. Recycling is performed on-site for reuse in the same system, while reclaiming involves
off-site processing to ARI Standard 700 purity
C. Recycling can only be done on small appliances, while reclaiming is for large systems
D. There is no meaningful difference between the two terms
CORRECT ANSWER: B. Recycling is performed on-site for reuse in the same
system, while reclaiming involves off-site processing to ARI Standard 700
purity
Rationale: Recycling involves cleaning refrigerant on-site using specialized equipment to
remove contaminants such as oil, moisture, and acids, allowing the refrigerant to be
returned to the same system. Reclaiming is a more rigorous process performed at an off-
site facility that chemically analyzes and processes refrigerant to meet ARI Standard 700
purity specifications, ensuring it is equivalent to new product.
Question 10: When servicing a system after opening it for repair, what is the
purpose of performing a deep vacuum?
A. To remove non-condensable gases and moisture from the system
B. To test the system's pressure rating
C. To verify the amount of refrigerant remaining in the system
D. To check for electrical insulation resistance
CORRECT ANSWER: A. To remove non-condensable gases and moisture from
the system
Rationale: A deep vacuum is performed to remove moisture and non-condensable gases
(such as air) from a refrigeration system after it has been opened for service. Moisture
can cause acid formation and compressor failure, while non-condensable gases reduce
system efficiency and increase operating pressures. The specific vacuum level required
depends on the refrigerant type and system characteristics.
Question 11: Who is required to hold EPA Section 608 certification?
A. Only technicians who install new HVAC equipment
B. Any person who maintains, services, repairs, or disposes of appliances containing
ozone-depleting refrigerants
C. Only technicians working in commercial refrigeration
D. Only the lead technician on a service call
CORRECT ANSWER: B. Any person who maintains, services, repairs, or
disposes of appliances containing ozone-depleting refrigerants
Rationale: Section 608 of the Clean Air Act mandates that all individuals who maintain,
service, repair, or dispose of appliances that contain ozone-depleting refrigerants must
be certified in proper refrigerant handling techniques. This includes technicians,
apprentices, and anyone else performing these activities, not just those in specific roles
or equipment categories.
