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The evaporator coil is the component in an air conditioning system that is primarily responsible for removing moisture from the air. When warm, humid air from the indoor space passes over the evaporator coil, the refrigerant inside the coil evaporates at low pressure, absorbing heat from the air. This process cools the air and causes moisture to condense on the coil’s surface. The rate of condensation increases with the temperature and humidity of the incoming air, effectively dehumidifying the space.

While other components play vital roles in the cooling process, the function of dehumidification is specifically tied to the evaporator coil. The compressor circulates the refrigerant but does not directly interact with the moisture in the air; it compresses the refrigerant to raise its pressure and temperature. The expansion valve regulates the flow of refrigerant into the evaporator coil and doesn't remove moisture. The condenser coil, located outside, releases the heat absorbed from the indoor air but is not involved in moisture removal either. Hence, the evaporator coil is the correct answer for this question about dehumidification.

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