HVAC Excellence Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

HVAC Excellence Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is the function of an expansion valve in a refrigeration cycle? To regulate refrigerant flow into the evaporator. Why is refrigerant recovery necessary before servicing? To prevent release of harmful chemicals and comply with EPA regulations. What is the purpose of a condensate drain in an air conditioner? To remove moisture collected from the air. What is the function of a blower fan in an HVAC system? To circulate air through ductwork and across heating/cooling coils. What is a duct system designed to do? Deliver conditioned air to occupied spaces efficiently. What is a common cause of low refrigerant pressure? Leak in the refrigerant line. Why should air filters be changed regularly? 2 To maintain airflow and indoor air quality. What is a static pressure measurement used for in HVAC systems? To determine resistance in ductwork and airflow restrictions. What does the term “ventilation” refer to in HVAC? The exchange of indoor air with outdoor air to maintain air quality. Why is insulation important for refrigerant lines? To prevent condensation and energy loss. What is the role of a compressor in a refrigeration cycle? To raise the pressure and temperature of the refrigerant vapor. What is a common symptom of a dirty evaporator coil? Reduced cooling efficiency. Why are proper refrigerant charge levels critical? To ensure optimal system performance and prevent damage. What does a programmable thermostat allow? Scheduling of temperature changes to save energy. 3 What is the purpose of a safety limit switch in a furnace? To shut off the system if temperatures exceed safe levels. What is the difference between a split system and a packaged system? A split system has separate indoor and outdoor units, while a packaged system combines components in one unit. What is a common cause of ice formation on an evaporator coil? Restricted airflow or low refrigerant. What does an economizer do in an HVAC system? Uses outdoor air for cooling when conditions are favorable to save energy. Why is proper duct sealing important? To prevent air leaks and maintain system efficiency. What is the purpose of a humidifier in an HVAC system? To add moisture to indoor air for comfort. What is the purpose of a dehumidifier in an HVAC system? To remove excess moisture from indoor air. 4 What is the primary function of a thermostat in an HVAC system? To regulate indoor temperature by controlling heating and cooling equipment. What does SEER stand for in air conditioning? Seasonal Energy Efficiency Ratio. What is the main purpose of a heat exchanger in a furnace? To transfer heat from combustion gases to air without mixing the two. What is superheat in refrigeration systems? The temperature of refrigerant vapor above its boiling point. What is subcooling in an air conditioning system? The temperature of refrigerant liquid below its condensation point. Why is proper airflow important in HVAC systems? To ensure efficient heat transfer and system performance. What is the role of an air handler? To move and condition air throughout the building. Why should refrigerant lines be properly