EPA Section 608 Certification Exam
(2025/2026) – Full 1000-Question
Study Set with 100% Answers
This document contains a complete 100-question study set with expert-verified and
polished solutions for the EPA Section 608 Certification Exam 2025/2026. It thoroughly
covers the Core section and specialized areas: Type I (Small Appliances), Type II (High-
Pressure Systems), and Type III (Low-Pressure Systems). Topics include environmental
protection, ozone depletion, Clean Air Act compliance, refrigerant handling, recovery,
recycling, and safety standards. Designed for certification readiness, this resource
provides the essential preparation needed to achieve EPA Section 608 certification with
confidence.
What does ozone in the stratosphere above the earth consist of?
a. Molecules containing 2 oxygen atoms.
,b. Molecules containing 3 oxygen atoms.
c. Molecules containing 4 oxygen atoms.
d. Molecules containing 5 oxygen atoms ,,correct answer,,,..b.
Molecules containing 3 oxygen atoms.
Which of the following refrigerants has the lowest global warming
potential?
a. R-134a
b. R-407C
c. R-410A
d. R-600a ,,correct answer,,,..d. R-600a
Which of the following gases is used as the baseline
measurement for global warming potential?
a. Ammonia
b. Carbon Dioxide
c. CFC-12
d. Propane ,,correct answer,,,..b. Carbon Dioxide
Which type of refrigerant typically has the lowest global warming
potential?
a. HCFCs
b. HFOs
c. HFCs
d. All are equal ,,correct answer,,,..b. HFOs
What is the state of refrigerant entering the compressor of a
refrigeration system?
a. Low pressure subcooled liquid
b. Low pressure superheated vapor
c. High pressure subcooled liquid
d. High pressure subcooled vapor ,,correct answer,,,..b. Low
pressure superheated vapor
,How does the global warming potential of R-410A compare to that
of carbon dioxide?
a. It is lower.
b. They are equal.
c. It is hundreds of times greater.
d. It is thousands of times greater. ,,correct answer,,,..d. It is
thousands of times greater.
How do the global warming potentials of isobutane
(R-600a), propane (R-290), and R-441A compare to
the GWPs of HFC-134a, R404A, and R-410A?
a. They are significantly higher.
b. They are significantly lower.
c. They are approximately equal
d. They are slightly higher. ,,correct answer,,,..b. They are
significantly lower.
What are the characteristics of hydrofluoroolefins (HFOs)?
a. Non-ozone depleting and have high global warming potentials.
b. Non-ozone depleting and have low global warming potentials.
c. Ozone depleting and have high global warming potentials.
d. Ozone depleting and have low global warming potentials.
,,correct answer,,,..b. Non-ozone depleting and have low global
warming potentials.
Why are HFO refrigerants less flammable than
hydrocarbon refrigerants?
a. They contain chlorine.
b. They contain bromine.
c. They contain fluorine.
d. They contain carbon. ,,correct answer,,,..c. They contain
fluorine.
Which of the following refrigerants is an HFO?
a. R-1234yf
, b. R-123
c. R-134a
d. All three are HFOs ,,correct answer,,,..a. R-1234yf
What characteristics of HFC refrigerants make them damaging to
the environment?
a. They are toxic to plants and animals at low doses.
b. They contain chlorine which damages the ozone layer.
c. They have high Ozone Depletion Potential (ODP)
d. They can have very high global warming potentials. ,,correct
answer,,,..d. They can have very high global warming
potentials.
Why are some of the hydrofluoroolefins classified as A2L?
a. They have toxicity characteristics.
b. They are less flammable than hydrocarbon refrigerants, but
most are still mildly flammable.
c. They are prohibited for use in the U.S.
d. They have ozone depleting potentials and have
low global warming potentials. ,,correct answer,,,..b. They are
less flammable than hydrocarbon refrigerants, but most are still
mildly flammable.
How many ozone molecules can each chlorine atom in the
stratosphere destroy?
a. 1,000 molecules
b. 100,000 molecules
c. 100,000,000 molecules
d. None. Chlorine is not the element in refrigerant that harms
ozone. ,,correct answer,,,..b. 100,000 molecules
An example of a CFC refrigerant is:
a. R-134a
b. R-123
c. R-22
(2025/2026) – Full 1000-Question
Study Set with 100% Answers
This document contains a complete 100-question study set with expert-verified and
polished solutions for the EPA Section 608 Certification Exam 2025/2026. It thoroughly
covers the Core section and specialized areas: Type I (Small Appliances), Type II (High-
Pressure Systems), and Type III (Low-Pressure Systems). Topics include environmental
protection, ozone depletion, Clean Air Act compliance, refrigerant handling, recovery,
recycling, and safety standards. Designed for certification readiness, this resource
provides the essential preparation needed to achieve EPA Section 608 certification with
confidence.
What does ozone in the stratosphere above the earth consist of?
a. Molecules containing 2 oxygen atoms.
,b. Molecules containing 3 oxygen atoms.
c. Molecules containing 4 oxygen atoms.
d. Molecules containing 5 oxygen atoms ,,correct answer,,,..b.
Molecules containing 3 oxygen atoms.
Which of the following refrigerants has the lowest global warming
potential?
a. R-134a
b. R-407C
c. R-410A
d. R-600a ,,correct answer,,,..d. R-600a
Which of the following gases is used as the baseline
measurement for global warming potential?
a. Ammonia
b. Carbon Dioxide
c. CFC-12
d. Propane ,,correct answer,,,..b. Carbon Dioxide
Which type of refrigerant typically has the lowest global warming
potential?
a. HCFCs
b. HFOs
c. HFCs
d. All are equal ,,correct answer,,,..b. HFOs
What is the state of refrigerant entering the compressor of a
refrigeration system?
a. Low pressure subcooled liquid
b. Low pressure superheated vapor
c. High pressure subcooled liquid
d. High pressure subcooled vapor ,,correct answer,,,..b. Low
pressure superheated vapor
,How does the global warming potential of R-410A compare to that
of carbon dioxide?
a. It is lower.
b. They are equal.
c. It is hundreds of times greater.
d. It is thousands of times greater. ,,correct answer,,,..d. It is
thousands of times greater.
How do the global warming potentials of isobutane
(R-600a), propane (R-290), and R-441A compare to
the GWPs of HFC-134a, R404A, and R-410A?
a. They are significantly higher.
b. They are significantly lower.
c. They are approximately equal
d. They are slightly higher. ,,correct answer,,,..b. They are
significantly lower.
What are the characteristics of hydrofluoroolefins (HFOs)?
a. Non-ozone depleting and have high global warming potentials.
b. Non-ozone depleting and have low global warming potentials.
c. Ozone depleting and have high global warming potentials.
d. Ozone depleting and have low global warming potentials.
,,correct answer,,,..b. Non-ozone depleting and have low global
warming potentials.
Why are HFO refrigerants less flammable than
hydrocarbon refrigerants?
a. They contain chlorine.
b. They contain bromine.
c. They contain fluorine.
d. They contain carbon. ,,correct answer,,,..c. They contain
fluorine.
Which of the following refrigerants is an HFO?
a. R-1234yf
, b. R-123
c. R-134a
d. All three are HFOs ,,correct answer,,,..a. R-1234yf
What characteristics of HFC refrigerants make them damaging to
the environment?
a. They are toxic to plants and animals at low doses.
b. They contain chlorine which damages the ozone layer.
c. They have high Ozone Depletion Potential (ODP)
d. They can have very high global warming potentials. ,,correct
answer,,,..d. They can have very high global warming
potentials.
Why are some of the hydrofluoroolefins classified as A2L?
a. They have toxicity characteristics.
b. They are less flammable than hydrocarbon refrigerants, but
most are still mildly flammable.
c. They are prohibited for use in the U.S.
d. They have ozone depleting potentials and have
low global warming potentials. ,,correct answer,,,..b. They are
less flammable than hydrocarbon refrigerants, but most are still
mildly flammable.
How many ozone molecules can each chlorine atom in the
stratosphere destroy?
a. 1,000 molecules
b. 100,000 molecules
c. 100,000,000 molecules
d. None. Chlorine is not the element in refrigerant that harms
ozone. ,,correct answer,,,..b. 100,000 molecules
An example of a CFC refrigerant is:
a. R-134a
b. R-123
c. R-22
