The evaporator coil, located inside the air conditioner, is responsible for absorbing heat from the indoor air. As the refrigerant flows through the coil, it expands and becomes cold, allowing it to absorb heat from the surrounding air. The fan blows air over the coil, transferring the heat to the refrigerant, which is then pumped back outside to the condenser to release the heat. The evaporator coil is a critical component of the air conditioning system, as it enables the transfer of heat from the indoor air to the refrigerant.