Texas HVAC Licensing Test Prep Questions And
Correct Answer with Rational (100% verified
answer) Q & A 2026 /
Instant download PDF
1. What is the primary function of an HVAC system?
A. Generate electricity
B. Control indoor air quality and temperature
C. Produce refrigeration only
D. Filter water
Answer: B
Rationale: HVAC systems are designed to heat, ventilate, and cool indoor spaces for comfort and
air quality.
2. Which refrigerant is commonly used in modern HVAC systems?
A. R-12
B. R-22
C. R-410A
D. Ammonia only
Answer: C
Rationale: R-410A is widely used in modern systems due to its lower ozone depletion impact.
3. What does BTU stand for?
A. British Thermal Unit
B. Basic Thermal Utility
,C. Balanced Temperature Unit
D. Boiler Thermal Unit
Answer: A
Rationale: BTU measures heat energy in HVAC systems.
4. What component compresses refrigerant in an AC system?
A. Evaporator
B. Compressor
C. Condenser
D. Expansion valve
Answer: B
Rationale: The compressor increases refrigerant pressure and temperature.
5. What is the purpose of the evaporator coil?
A. Releases heat outside
B. Absorbs heat from indoor air
C. Compresses gas
D. Stores refrigerant
Answer: B
Rationale: The evaporator absorbs heat, cooling indoor air.
6. Which tool is used to measure refrigerant pressure?
A. Thermometer
B. Manifold gauge
C. Voltmeter
D. Psychrometer
Answer: B
Rationale: Manifold gauges measure system pressure.
7. What does SEER rating measure?
, A. Sound efficiency
B. Seasonal Energy Efficiency Ratio
C. System Electrical Energy Rate
D. Solar Efficiency Evaluation Rating
Answer: B
Rationale: SEER measures cooling efficiency over a season.
8. What is the function of a thermostat?
A. Compress refrigerant
B. Control temperature
C. Filter air
D. Increase voltage
Answer: B
Rationale: Thermostats regulate indoor temperature.
9. Which gas is most dangerous when leaked in HVAC systems?
A. Oxygen
B. Carbon dioxide
C. Refrigerant gas in high concentration
D. Nitrogen
Answer: C
Rationale: Refrigerant leaks can cause health and environmental hazards.
10. What is superheat?
A. Liquid refrigerant cooling
B. Temperature above boiling point of refrigerant vapor
C. Heat lost in condenser
D. Electrical overload
Answer: B
Rationale: Superheat ensures refrigerant is fully vaporized.
Correct Answer with Rational (100% verified
answer) Q & A 2026 /
Instant download PDF
1. What is the primary function of an HVAC system?
A. Generate electricity
B. Control indoor air quality and temperature
C. Produce refrigeration only
D. Filter water
Answer: B
Rationale: HVAC systems are designed to heat, ventilate, and cool indoor spaces for comfort and
air quality.
2. Which refrigerant is commonly used in modern HVAC systems?
A. R-12
B. R-22
C. R-410A
D. Ammonia only
Answer: C
Rationale: R-410A is widely used in modern systems due to its lower ozone depletion impact.
3. What does BTU stand for?
A. British Thermal Unit
B. Basic Thermal Utility
,C. Balanced Temperature Unit
D. Boiler Thermal Unit
Answer: A
Rationale: BTU measures heat energy in HVAC systems.
4. What component compresses refrigerant in an AC system?
A. Evaporator
B. Compressor
C. Condenser
D. Expansion valve
Answer: B
Rationale: The compressor increases refrigerant pressure and temperature.
5. What is the purpose of the evaporator coil?
A. Releases heat outside
B. Absorbs heat from indoor air
C. Compresses gas
D. Stores refrigerant
Answer: B
Rationale: The evaporator absorbs heat, cooling indoor air.
6. Which tool is used to measure refrigerant pressure?
A. Thermometer
B. Manifold gauge
C. Voltmeter
D. Psychrometer
Answer: B
Rationale: Manifold gauges measure system pressure.
7. What does SEER rating measure?
, A. Sound efficiency
B. Seasonal Energy Efficiency Ratio
C. System Electrical Energy Rate
D. Solar Efficiency Evaluation Rating
Answer: B
Rationale: SEER measures cooling efficiency over a season.
8. What is the function of a thermostat?
A. Compress refrigerant
B. Control temperature
C. Filter air
D. Increase voltage
Answer: B
Rationale: Thermostats regulate indoor temperature.
9. Which gas is most dangerous when leaked in HVAC systems?
A. Oxygen
B. Carbon dioxide
C. Refrigerant gas in high concentration
D. Nitrogen
Answer: C
Rationale: Refrigerant leaks can cause health and environmental hazards.
10. What is superheat?
A. Liquid refrigerant cooling
B. Temperature above boiling point of refrigerant vapor
C. Heat lost in condenser
D. Electrical overload
Answer: B
Rationale: Superheat ensures refrigerant is fully vaporized.
