Efficiency Factors and Performance Considerations Coefficient of Performance depends on temperature differential, refrigerant properties, airflow, and system design, with well-installed units often delivering two to four units of heat for each unit of electricity consumed. In cooling mode, the indoor coil acts as the evaporator that absorbs heat from indoor air, while the outdoor coil releases heat to the exterior, functioning much like a conventional air conditioner but often with greater efficiency.
The Compressor's Critical Function in Heat Pump Performance and Efficiency
How Refrigerant Moves Heat Evaporation in the Outdoor Coil In the outdoor evaporator, low-pressure liquid refrigerant expands and evaporates, drawing in thermal energy from the ambient air even at temperatures well above absolute zero. Compression and Temperature Rise The vapor refrigerant is drawn into the compressor, where mechanical work raises its temperature and pressure significantly, transforming it into a high-temperature, high-pressure superheated vapor.
As the refrigerant changes phase, it releases the thermal energy collected outdoors plus the energy added by compression, providing efficient space heating and often domestic hot water preheating. Condensation in the Indoor Coil Inside the building, the hot refrigerant vapor flows through the indoor condenser, where it condenses back into a liquid as it transfers heat to the indoor air or to a hydronic heating distribution system.
The Compressor's Role in Boosting Refrigerant Temperature and Pressure
This drop prepares the refrigerant to absorb more outdoor heat, completing the closed-loop cycle that continuously moves thermal energy from outside to inside. Cold climates may require specialized refrigerants, larger outdoor coils, or auxiliary backup heating to maintain performance as outdoor temperatures fall, while proper sizing and airflow are essential to avoid efficiency losses and ensure consistent comfort.
More About How does an air source heat pump work
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