Colorado HVAC Contractor License
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
1. What is the primary purpose of a mechanical/HVAC permit?
A. To establish equipment pricing
B. To verify the contractor's profit margin
C. To ensure the installation complies with applicable codes and safety
requirements
D. To determine the manufacturer's warranty period
Answer: C. To ensure the installation complies with applicable codes and safety
requirements
Rationale: Permits provide a regulatory mechanism for reviewing HVAC
installations for compliance with applicable building, mechanical, fuel-gas,
electrical, energy, and safety requirements.
2. Which component transfers heat from indoor air to the refrigerant during
cooling?
,A. Condenser coil
B. Evaporator coil
C. Compressor
D. Receiver
Answer: B. Evaporator coil
Rationale: The evaporator absorbs heat from the conditioned space as
refrigerant evaporates inside the coil.
3. What is the primary function of a compressor in a vapor-compression
refrigeration system?
A. Reduce refrigerant pressure
B. Remove moisture from air
C. Raise refrigerant pressure and circulate refrigerant
D. Meter refrigerant into the evaporator
Answer: C. Raise refrigerant pressure and circulate refrigerant
Rationale: The compressor takes low-pressure vapor from the evaporator and
compresses it into a high-pressure vapor for delivery to the condenser.
4. Which refrigerant condition normally enters the compressor?
A. High-pressure liquid
B. Low-pressure vapor
C. High-pressure liquid-vapor mixture
D. Low-pressure liquid
Answer: B. Low-pressure vapor
Rationale: The compressor is designed to receive refrigerant vapor. Liquid
entering a reciprocating or scroll compressor can cause severe damage.
5. What is the purpose of a condenser?
,A. Absorb heat from the occupied space
B. Remove heat from refrigerant and reject it to another medium
C. Meter refrigerant
D. Increase indoor humidity
Answer: B. Remove heat from refrigerant and reject it to another medium
Rationale: The condenser rejects heat absorbed in the evaporator plus the heat
added by the compressor.
6. What does superheat describe?
A. Temperature of liquid below its saturation temperature
B. Temperature of vapor above its saturation temperature
C. Pressure of liquid above design pressure
D. Temperature of a condenser below outdoor temperature
Answer: B. Temperature of vapor above its saturation temperature
Rationale: Superheat is the amount by which a vapor's actual temperature
exceeds its saturation temperature at a given pressure.
7. What does subcooling describe?
A. Cooling vapor below freezing
B. Cooling liquid below its saturation temperature
C. Heating liquid above saturation
D. Heating vapor above saturation
Answer: B. Cooling liquid below its saturation temperature
Rationale: Subcooling indicates how far a liquid refrigerant has been cooled
below its saturation temperature at the measured pressure.
8. Which device commonly meters refrigerant into an evaporator?
A. Compressor
B. Condenser fan
, C. Expansion valve
D. Accumulator
Answer: C. Expansion valve
Rationale: An expansion device reduces refrigerant pressure and controls
refrigerant flow into the evaporator.
9. What is the purpose of a filter-drier?
A. Increase compressor horsepower
B. Remove moisture and contaminants from the refrigerant system
C. Increase refrigerant pressure
D. Increase airflow
Answer: B. Remove moisture and contaminants from the refrigerant system
Rationale: Filter-driers help capture moisture, acids, and particulate
contamination that could damage refrigeration components.
10.What is the purpose of an accumulator?
A. Store excess refrigerant entering the compressor
B. Increase duct pressure
C. Replace the condenser
D. Meter combustion air
Answer: A. Store excess refrigerant entering the compressor
Rationale: A suction accumulator helps prevent liquid refrigerant from reaching
the compressor by temporarily trapping liquid.
11.What is the most common purpose of a thermostatic expansion valve?
A. Control evaporator superheat
B. Control condenser pressure
C. Increase compressor voltage
D. Control combustion temperature
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
1. What is the primary purpose of a mechanical/HVAC permit?
A. To establish equipment pricing
B. To verify the contractor's profit margin
C. To ensure the installation complies with applicable codes and safety
requirements
D. To determine the manufacturer's warranty period
Answer: C. To ensure the installation complies with applicable codes and safety
requirements
Rationale: Permits provide a regulatory mechanism for reviewing HVAC
installations for compliance with applicable building, mechanical, fuel-gas,
electrical, energy, and safety requirements.
2. Which component transfers heat from indoor air to the refrigerant during
cooling?
,A. Condenser coil
B. Evaporator coil
C. Compressor
D. Receiver
Answer: B. Evaporator coil
Rationale: The evaporator absorbs heat from the conditioned space as
refrigerant evaporates inside the coil.
3. What is the primary function of a compressor in a vapor-compression
refrigeration system?
A. Reduce refrigerant pressure
B. Remove moisture from air
C. Raise refrigerant pressure and circulate refrigerant
D. Meter refrigerant into the evaporator
Answer: C. Raise refrigerant pressure and circulate refrigerant
Rationale: The compressor takes low-pressure vapor from the evaporator and
compresses it into a high-pressure vapor for delivery to the condenser.
4. Which refrigerant condition normally enters the compressor?
A. High-pressure liquid
B. Low-pressure vapor
C. High-pressure liquid-vapor mixture
D. Low-pressure liquid
Answer: B. Low-pressure vapor
Rationale: The compressor is designed to receive refrigerant vapor. Liquid
entering a reciprocating or scroll compressor can cause severe damage.
5. What is the purpose of a condenser?
,A. Absorb heat from the occupied space
B. Remove heat from refrigerant and reject it to another medium
C. Meter refrigerant
D. Increase indoor humidity
Answer: B. Remove heat from refrigerant and reject it to another medium
Rationale: The condenser rejects heat absorbed in the evaporator plus the heat
added by the compressor.
6. What does superheat describe?
A. Temperature of liquid below its saturation temperature
B. Temperature of vapor above its saturation temperature
C. Pressure of liquid above design pressure
D. Temperature of a condenser below outdoor temperature
Answer: B. Temperature of vapor above its saturation temperature
Rationale: Superheat is the amount by which a vapor's actual temperature
exceeds its saturation temperature at a given pressure.
7. What does subcooling describe?
A. Cooling vapor below freezing
B. Cooling liquid below its saturation temperature
C. Heating liquid above saturation
D. Heating vapor above saturation
Answer: B. Cooling liquid below its saturation temperature
Rationale: Subcooling indicates how far a liquid refrigerant has been cooled
below its saturation temperature at the measured pressure.
8. Which device commonly meters refrigerant into an evaporator?
A. Compressor
B. Condenser fan
, C. Expansion valve
D. Accumulator
Answer: C. Expansion valve
Rationale: An expansion device reduces refrigerant pressure and controls
refrigerant flow into the evaporator.
9. What is the purpose of a filter-drier?
A. Increase compressor horsepower
B. Remove moisture and contaminants from the refrigerant system
C. Increase refrigerant pressure
D. Increase airflow
Answer: B. Remove moisture and contaminants from the refrigerant system
Rationale: Filter-driers help capture moisture, acids, and particulate
contamination that could damage refrigeration components.
10.What is the purpose of an accumulator?
A. Store excess refrigerant entering the compressor
B. Increase duct pressure
C. Replace the condenser
D. Meter combustion air
Answer: A. Store excess refrigerant entering the compressor
Rationale: A suction accumulator helps prevent liquid refrigerant from reaching
the compressor by temporarily trapping liquid.
11.What is the most common purpose of a thermostatic expansion valve?
A. Control evaporator superheat
B. Control condenser pressure
C. Increase compressor voltage
D. Control combustion temperature
