The indoor coil operates as what component during the heating cycle?

During the heating cycle of a heat pump, the indoor coil acts as the condenser. In this configuration, the heat pump absorbs heat from the outdoor air and transfers it to the indoor space. The refrigerant, which is in a low-pressure gaseous state, enters the indoor coil, where it releases heat as it condenses into a liquid state. This heat is then distributed into the living space, warming it.

Understanding the roles of the components in a heat pump is crucial. The expansion valve, usually located in the system, regulates the flow of refrigerant and lowers its pressure before it enters the evaporator. The evaporator, found in the outdoor unit during the heating cycle, absorbs heat from the air outside, converting the refrigerant into a gas. The compressor works to circulate the refrigerant throughout the system and increases the pressure of the refrigerant gas before it enters the indoor condenser. Thus, during heating, the indoor coil's function as a condenser is essential for transferring heat indoors effectively.