What component is essential for removing moisture from the air in an A/C system?

The evaporator coil is essential for removing moisture from the air in an A/C system because it operates at a low temperature and pressure, allowing refrigerant to absorb heat from the indoor air. As warm air passes over the cold surface of the evaporator coil, the temperature of the air drops, and moisture condenses out of the air onto the coil. This process effectively reduces humidity, making the indoor environment more comfortable. The condensed moisture then drains away, typically through a drainage system, ensuring that the air remains dry and the cooling efficiency is maintained.

In contrast, the expansion valve regulates the flow of refrigerant into the evaporator coil, while the condenser coil dissipates heat from the refrigerant and doesn’t play a direct role in moisture removal. The compressor circulates refrigerant throughout the system by compressing it into a high-pressure state, but it does not directly address humidity control. Thus, the evaporator coil is the primary component responsible for moisture removal in an air conditioning system.