What is the role of the evaporator coil in an A/C system?

The role of the evaporator coil in an A/C system is primarily to absorb heat from the indoor air, which effectively cools the space. As warm air from the room is blown over the evaporator coil, the refrigerant inside the coil absorbs this heat, leading to a reduction in the air temperature. This process is crucial for the cooling operation of the air conditioning system, as it not only cools the air but also allows the refrigerant to change from a liquid to a gas. The absorption of heat is essential for the overall efficiency of the A/C system, facilitating the continuous circulation of cool air throughout the building.

The other options describe functions that do not align with the specific role of the evaporator coil. Circulating the refrigerant is a function of the compressor and the entire system, while maintaining refrigerant pressure is managed by the system in general, including components such as the expansion valve. Releasing heat outdoors is a function of the condenser coil, which is designed to expel the heat that the refrigerant has picked up from the inside, completing the refrigeration cycle.