There are two types of Coils: Evaporator and condenser coil

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The indoor coil is an essential component of the heating, ventilation, and air conditioning system. The coil is located inside the air handler unit or attached to the furnace. Its primary function is to extract heat and humidity from the indoor air.

Condenser Coil

The outdoor coil, is an essential component of the HVAC system's outdoor unit. Its primary function is to facilitate the transfer of heat from the refrigerant to the outdoor environment, it allows the refrigerant to release excess heat from the home.