HVAC Certification Practice Tests Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

HVAC Certification Practice Tests Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What does a contactor do in an HVAC system? Controls power to major components. What is the purpose of a filter drier? Remove moisture and contaminants from refrigerant. What happens if an air filter is clogged? Reduced airflow and system efficiency. What is latent heat? Heat involved in a phase change without temperature change. What type of compressor is commonly used in residential systems? Scroll compressor. What does EPA Section 608 regulate? Handling and disposal of refrigerants. What is the main function of ductwork? 2 Distribute conditioned air. What causes short cycling in HVAC systems? Frequent on-off operation due to improper sizing or controls. What is a heat pump capable of doing? Heating and cooling using the same system. What component reverses refrigerant flow in a heat pump? The reversing valve. What is the purpose of insulation on refrigerant lines? Prevent heat gain or loss and condensation. What type of maintenance improves system efficiency? Regular cleaning and inspection. What is static pressure in duct systems? Resistance to airflow within ducts. What is the main job of the blower motor? Move air through the system. 3 What type of valve meters refrigerant flow? Expansion valve. What does HVAC stand for? Heating, Ventilation, and Air Conditioning. What is the primary purpose of ventilation in an HVAC system? To supply fresh air and remove indoor contaminants. What component of an air conditioning system absorbs heat from indoor air? The evaporator coil. What refrigerant property allows it to absorb heat efficiently? Its ability to change phase from liquid to vapor. What device raises the pressure and temperature of refrigerant vapor? The compressor. What HVAC component releases heat to the outside air? The condenser coil. 4 What is superheat in refrigeration? The temperature of refrigerant vapor above its boiling point. What is subcooling? Cooling liquid refrigerant below its condensation temperature. What tool is used to measure airflow in duct systems? An anemometer. What unit is used to measure cooling capacity? BTUs. What does SEER measure? Cooling efficiency of an air conditioning