Nachi- HVAC System Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

Nachi- HVAC System Questions and Answers | Latest Version | 2025/2026 | Correct & Verified Which component of an HVAC system is responsible for heating the air in a forced-air system? A) Condenser B) Evaporator coil C) Furnace D) Thermostat C) Furnace What is the primary function of the evaporator coil in an air conditioning system? A) To compress refrigerant B) To remove heat from indoor air C) To circulate air D) To filter dust B) To remove heat from indoor air Which type of refrigerant is commonly used in modern residential HVAC systems? A) R-22 B) R-134a C) R-410A D) R-12 2 C) R-410A What device in an HVAC system regulates the temperature inside a building? A) Compressor B) Thermostat C) Expansion valve D) Blower motor B) Thermostat Which component is responsible for compressing refrigerant gas in an air conditioning system? A) Condenser B) Evaporator C) Compressor D) Expansion valve C) Compressor Why is proper duct insulation important in an HVAC system? A) To reduce noise only B) To prevent heat loss or gain and improve efficiency C) To increase airflow velocity D) To filter dust B) To prevent heat loss or gain and improve efficiency 3 Which HVAC component releases heat from the refrigerant to the outdoor air? A) Evaporator coil B) Blower C) Condenser coil D) Furnace C) Condenser coil What type of filter is most effective at removing fine particles from the air? A) Fiberglass B) HEPA filter C) Mesh screen D) Electrostatic filter B) HEPA filter Which system uses water or steam to heat spaces? A) Forced-air system B) Radiant heating system C) Heat pump D) Packaged terminal AC B) Radiant heating system What is the main purpose of the expansion valve in a refrigeration cycle? A) To heat refrigerant 4 B) To compress refrigerant C) To regulate refrigerant flow into the evaporator D) To circulate air C) To regulate refrigerant flow into the evaporator Which component moves air through ducts in a forced-air HVAC system? A) Thermostat B) Blower fan C) Evaporator coil D) Condenser B) Blower fan Which HVAC system component removes humidity from the indoor air? A) Evaporator coil B) Thermostat C) Furnace D) Expansion valve A) Evaporator coil What is the function of a heat pump in HVAC systems? A) Only heats air B) Only cools air C) Can both heat and cool by reversing refrigerant