Heating, Ventilation & Air Conditioning
(HVAC) Certification Prep Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
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1. What is the primary purpose of an HVAC system?
A. Generate electricity
B. Control indoor temperature and air quality
C. Produce hot water
D. Increase outdoor airflow
Answer: B
Rationale: HVAC systems regulate heating, cooling, and indoor air
quality for occupant comfort and safety.
2. Which refrigerant is commonly used in modern HVAC systems?
A. R-12
B. R-22
C. R-410A
D. Ammonia
Answer: C
Rationale: R-410A is widely used in modern systems due to its
, efficiency and lower environmental impact compared to older
refrigerants.
3. What tool is used to measure electrical current in HVAC systems?
A. Thermometer
B. Manometer
C. Clamp meter
D. Hygrometer
Answer: C
Rationale: A clamp meter measures electrical current without
disconnecting the circuit.
4. What does SEER rating measure?
A. Heating efficiency
B. Cooling efficiency
C. Airflow speed
D. Refrigerant pressure
Answer: B
Rationale: SEER (Seasonal Energy Efficiency Ratio) measures
cooling efficiency over a season.
5. What component removes moisture from air in HVAC systems?
A. Compressor
B. Evaporator coil
C. Condenser
D. Expansion valve
Answer: B
Rationale: The evaporator coil cools air and removes humidity
through condensation.
, 6. What is the function of a compressor?
A. Expand refrigerant
B. Pump refrigerant and increase pressure
C. Filter air
D. Cool air directly
Answer: B
Rationale: The compressor circulates refrigerant and raises its
pressure and temperature.
7. Which gas is most commonly used for heating in residential HVAC
systems?
A. Oxygen
B. Natural gas
C. Carbon dioxide
D. Nitrogen
Answer: B
Rationale: Natural gas is commonly used for furnaces in residential
heating.
8. What does a thermostat do?
A. Filters air
B. Measures refrigerant
C. Controls temperature
D. Compresses air
Answer: C
Rationale: A thermostat regulates system operation based on
temperature settings.
9. What is the purpose of ductwork?
A. Store refrigerant
(HVAC) Certification Prep Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
1. What is the primary purpose of an HVAC system?
A. Generate electricity
B. Control indoor temperature and air quality
C. Produce hot water
D. Increase outdoor airflow
Answer: B
Rationale: HVAC systems regulate heating, cooling, and indoor air
quality for occupant comfort and safety.
2. Which refrigerant is commonly used in modern HVAC systems?
A. R-12
B. R-22
C. R-410A
D. Ammonia
Answer: C
Rationale: R-410A is widely used in modern systems due to its
, efficiency and lower environmental impact compared to older
refrigerants.
3. What tool is used to measure electrical current in HVAC systems?
A. Thermometer
B. Manometer
C. Clamp meter
D. Hygrometer
Answer: C
Rationale: A clamp meter measures electrical current without
disconnecting the circuit.
4. What does SEER rating measure?
A. Heating efficiency
B. Cooling efficiency
C. Airflow speed
D. Refrigerant pressure
Answer: B
Rationale: SEER (Seasonal Energy Efficiency Ratio) measures
cooling efficiency over a season.
5. What component removes moisture from air in HVAC systems?
A. Compressor
B. Evaporator coil
C. Condenser
D. Expansion valve
Answer: B
Rationale: The evaporator coil cools air and removes humidity
through condensation.
, 6. What is the function of a compressor?
A. Expand refrigerant
B. Pump refrigerant and increase pressure
C. Filter air
D. Cool air directly
Answer: B
Rationale: The compressor circulates refrigerant and raises its
pressure and temperature.
7. Which gas is most commonly used for heating in residential HVAC
systems?
A. Oxygen
B. Natural gas
C. Carbon dioxide
D. Nitrogen
Answer: B
Rationale: Natural gas is commonly used for furnaces in residential
heating.
8. What does a thermostat do?
A. Filters air
B. Measures refrigerant
C. Controls temperature
D. Compresses air
Answer: C
Rationale: A thermostat regulates system operation based on
temperature settings.
9. What is the purpose of ductwork?
A. Store refrigerant
