SKILLCAT EPA 608 CERTIFICATION EXAM
2026/2027 – COMPLETE PRACTICE
QUESTIONS & VERIFIED ANSWERS | HVAC
EXAM PREP GUIDE
SKILLCAT EPA 608 CERTIFICATION EXAM 2026/2027 – COMPLETE PRACTICE
QUESTIONS & VERIFIED ANSWERS | HVAC EXAM PREP GUIDE
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DOCUMENT OVERVIEW & STUDY GUIDANCE
• This comprehensive practice exam contains 200 verified multiple-choice questions
covering all EPA 608 certification topics including core refrigeration principles, Type
I-III appliances, safety protocols, refrigerant handling, and environmental
regulations to ensure thorough exam preparation.
• Study systematically through all sections to build confidence in practical
knowledge and regulatory compliance; use rationales to understand the reasoning
behind correct answers and reinforce critical HVAC concepts required for
certification success.
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1. What is the primary purpose of the EPA 608 certification?
A) To train technicians in electrical work
B) To certify technicians who handle refrigerants and maintain air-conditioning and
refrigeration systems
C) To provide certification for plumbing work
D) To certify commercial building management
E) To license HVAC wholesalers
✓ CORRECT ANSWER: B) To certify technicians who handle refrigerants and
maintain air-conditioning and refrigeration systems
Rationale: The EPA 608 certification is specifically designed by the Environmental
Protection Agency to certify technicians who work with refrigerants in stationary air-
,conditioning and refrigeration systems. This certification ensures technicians
understand environmental regulations, proper handling procedures, and recovery
techniques to prevent ozone-depleting substance (ODS) release into the
atmosphere.
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2. Which type of refrigerant has the highest ozone depletion potential (ODP)?
A) R-22 (HCFC)
B) R-410A (HFC)
C) CFC-11 and CFC-12
D) R-134A (HFC)
E) R-404A (HFC/HFC blend)
✓ CORRECT ANSWER: C) CFC-11 and CFC-12
Rationale: CFCs (chlorofluorocarbons) have the highest ozone depletion potential
with an ODP of 1.0. CFC-11 and CFC-12 are the reference standard against which all
other refrigerants are compared. HCFCs like R-22 have an ODP of 0.05, and
HFCs/HFOs have zero ODP, making them alternatives with significantly lower
environmental impact.
═══════════════════════════════════════════════════════
═════════════════════════
3. What does the term "positive displacement" mean in compressor
terminology?
A) The compressor moves refrigerant in one direction only
B) The compressor physically moves or displaces a fixed volume of refrigerant with
each stroke or rotation
C) The compressor uses centrifugal force to move refrigerant
D) The compressor increases refrigerant velocity through an impeller
E) The compressor pressurizes refrigerant without mechanical movement
,✓ CORRECT ANSWER: B) The compressor physically moves or displaces a fixed
volume of refrigerant with each stroke or rotation
Rationale: Positive displacement compressors mechanically displace a fixed volume
of refrigerant with each stroke or rotation. This category includes reciprocating,
rotary, and scroll compressors. These compressors are more common in residential
and commercial HVAC systems compared to centrifugal compressors, which are
used in larger applications.
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4. Which of the following is an example of a Type I appliance?
A) Window air conditioning unit
B) Commercial refrigerator with more than 5 pounds of refrigerant
C) Self-contained commercial refrigeration unit with less than 5 pounds of
refrigerant
D) Chiller system in a large building
E) Walk-in freezer with 15 pounds of refrigerant
✓ CORRECT ANSWER: C) Self-contained commercial refrigeration unit with less
than 5 pounds of refrigerant
Rationale: Type I appliances are small, self-contained, commercially available air-
conditioning and refrigeration units that contain less than 5 pounds of refrigerant.
These typically include window units, portable air conditioners, and small
commercial refrigeration units. Type I technicians are allowed to perform
maintenance on these appliances without recovering refrigerant.
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5. What is the maximum charge size for a Type II appliance without requiring
EPA certification?
A) Less than 5 pounds
B) Less than 15 pounds
, C) Less than 25 pounds
D) Less than 50 pounds
E) There is no limit for Type II appliances
✓ CORRECT ANSWER: C) Less than 25 pounds
Rationale: Type II appliances are high-pressure appliances that contain 5-25 pounds
of refrigerant. Appliances with charges exceeding 25 pounds are classified as Type
III (low-pressure appliances). Type II requires different handling and recovery
procedures compared to Type I due to the higher refrigerant charge and pressure
requirements.
═══════════════════════════════════════════════════════
═════════════════════════
6. Which type of appliance is a large industrial chiller system classified as?
A) Type I
B) Type II
C) Type III
D) Type IV
E) Industrial Class
✓ CORRECT ANSWER: C) Type III
Rationale: Type III appliances are low-pressure appliances that typically contain 25
pounds or more of refrigerant. Large chiller systems, refrigerated transport
containers, and industrial refrigeration systems fall under this category. Type III
requires licensed technicians with proper recovery and recycling equipment to
handle refrigerant.
═══════════════════════════════════════════════════════
═════════════════════════
7. What is the boiling point of R-22 at atmospheric pressure?
A) -41.4°F (-41.4°C)
2026/2027 – COMPLETE PRACTICE
QUESTIONS & VERIFIED ANSWERS | HVAC
EXAM PREP GUIDE
SKILLCAT EPA 608 CERTIFICATION EXAM 2026/2027 – COMPLETE PRACTICE
QUESTIONS & VERIFIED ANSWERS | HVAC EXAM PREP GUIDE
═══════════════════════════════════════════════════════
═════════════════════════
DOCUMENT OVERVIEW & STUDY GUIDANCE
• This comprehensive practice exam contains 200 verified multiple-choice questions
covering all EPA 608 certification topics including core refrigeration principles, Type
I-III appliances, safety protocols, refrigerant handling, and environmental
regulations to ensure thorough exam preparation.
• Study systematically through all sections to build confidence in practical
knowledge and regulatory compliance; use rationales to understand the reasoning
behind correct answers and reinforce critical HVAC concepts required for
certification success.
═══════════════════════════════════════════════════════
═════════════════════════
1. What is the primary purpose of the EPA 608 certification?
A) To train technicians in electrical work
B) To certify technicians who handle refrigerants and maintain air-conditioning and
refrigeration systems
C) To provide certification for plumbing work
D) To certify commercial building management
E) To license HVAC wholesalers
✓ CORRECT ANSWER: B) To certify technicians who handle refrigerants and
maintain air-conditioning and refrigeration systems
Rationale: The EPA 608 certification is specifically designed by the Environmental
Protection Agency to certify technicians who work with refrigerants in stationary air-
,conditioning and refrigeration systems. This certification ensures technicians
understand environmental regulations, proper handling procedures, and recovery
techniques to prevent ozone-depleting substance (ODS) release into the
atmosphere.
═══════════════════════════════════════════════════════
═════════════════════════
2. Which type of refrigerant has the highest ozone depletion potential (ODP)?
A) R-22 (HCFC)
B) R-410A (HFC)
C) CFC-11 and CFC-12
D) R-134A (HFC)
E) R-404A (HFC/HFC blend)
✓ CORRECT ANSWER: C) CFC-11 and CFC-12
Rationale: CFCs (chlorofluorocarbons) have the highest ozone depletion potential
with an ODP of 1.0. CFC-11 and CFC-12 are the reference standard against which all
other refrigerants are compared. HCFCs like R-22 have an ODP of 0.05, and
HFCs/HFOs have zero ODP, making them alternatives with significantly lower
environmental impact.
═══════════════════════════════════════════════════════
═════════════════════════
3. What does the term "positive displacement" mean in compressor
terminology?
A) The compressor moves refrigerant in one direction only
B) The compressor physically moves or displaces a fixed volume of refrigerant with
each stroke or rotation
C) The compressor uses centrifugal force to move refrigerant
D) The compressor increases refrigerant velocity through an impeller
E) The compressor pressurizes refrigerant without mechanical movement
,✓ CORRECT ANSWER: B) The compressor physically moves or displaces a fixed
volume of refrigerant with each stroke or rotation
Rationale: Positive displacement compressors mechanically displace a fixed volume
of refrigerant with each stroke or rotation. This category includes reciprocating,
rotary, and scroll compressors. These compressors are more common in residential
and commercial HVAC systems compared to centrifugal compressors, which are
used in larger applications.
═══════════════════════════════════════════════════════
═════════════════════════
4. Which of the following is an example of a Type I appliance?
A) Window air conditioning unit
B) Commercial refrigerator with more than 5 pounds of refrigerant
C) Self-contained commercial refrigeration unit with less than 5 pounds of
refrigerant
D) Chiller system in a large building
E) Walk-in freezer with 15 pounds of refrigerant
✓ CORRECT ANSWER: C) Self-contained commercial refrigeration unit with less
than 5 pounds of refrigerant
Rationale: Type I appliances are small, self-contained, commercially available air-
conditioning and refrigeration units that contain less than 5 pounds of refrigerant.
These typically include window units, portable air conditioners, and small
commercial refrigeration units. Type I technicians are allowed to perform
maintenance on these appliances without recovering refrigerant.
═══════════════════════════════════════════════════════
═════════════════════════
5. What is the maximum charge size for a Type II appliance without requiring
EPA certification?
A) Less than 5 pounds
B) Less than 15 pounds
, C) Less than 25 pounds
D) Less than 50 pounds
E) There is no limit for Type II appliances
✓ CORRECT ANSWER: C) Less than 25 pounds
Rationale: Type II appliances are high-pressure appliances that contain 5-25 pounds
of refrigerant. Appliances with charges exceeding 25 pounds are classified as Type
III (low-pressure appliances). Type II requires different handling and recovery
procedures compared to Type I due to the higher refrigerant charge and pressure
requirements.
═══════════════════════════════════════════════════════
═════════════════════════
6. Which type of appliance is a large industrial chiller system classified as?
A) Type I
B) Type II
C) Type III
D) Type IV
E) Industrial Class
✓ CORRECT ANSWER: C) Type III
Rationale: Type III appliances are low-pressure appliances that typically contain 25
pounds or more of refrigerant. Large chiller systems, refrigerated transport
containers, and industrial refrigeration systems fall under this category. Type III
requires licensed technicians with proper recovery and recycling equipment to
handle refrigerant.
═══════════════════════════════════════════════════════
═════════════════════════
7. What is the boiling point of R-22 at atmospheric pressure?
A) -41.4°F (-41.4°C)
