During a defrost cycle, what mode is the heat pump operating in?

During a defrost cycle, the heat pump operates in heating mode. This process is essential in the operation of heat pumps, particularly in colder climates where frost buildup can impede efficiency.

The heat pump, which typically provides cooling during warmer months, uses the defrost cycle to eliminate frost from the evaporator coil. In heating mode during this cycle, the heat pump reverses the flow of refrigerant, allowing it to absorb heat from the outside air—even in cold temperatures—and transfer that heat to the indoor space to effectively melt away the frost.

This approach is crucial as it ensures that the system maintains its efficiency and functionality, preventing ice from forming and impacting the airflow and heat exchange processes. Understanding this operation helps in troubleshooting and maintaining heat pumps effectively.