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?
1
, ✔✔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.
2
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?
1
, ✔✔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.
2
