Which component of a split air conditioning system is installed in the duct?

The correct choice is the evaporator coil, which is a critical component in the cooling process of a split air conditioning system. The evaporator coil is designed to absorb heat from the indoor air as it passes through the system, causing the refrigerant inside the coil to evaporate and cool the air. When warm air from the room is drawn into the ductwork and passed over the evaporator coil, the refrigerant absorbs the heat, and cool air is then circulated back into the living space.

This function is essential for the effectiveness of air conditioning, as it directly impacts the temperature and humidity levels inside the building. The location of the evaporator coil in the duct allows for efficient heat exchange and optimal airflow, contributing to the overall cooling efficiency of the system.

In contrast, the compressor and condenser unit are typically located outside the building. The compressor is responsible for circulating the refrigerant and increasing its pressure before it reaches the condenser, where heat is released to the outside air. The expansion valve is also located in the line leading to the evaporator coil but is not installed directly in the duct itself; instead, it regulates the flow of refrigerant into the evaporator coil. Thus, the evaporator coil is the essential component that is installed