You have coils in two locations in your air conditioner. One set is called the evaporator coils, and they are located in the inside unit of your A/C. The other set is found in the condenser in the outdoor unit. Both sets circulate refrigerant and transfer heat. They are crucial to the cooling process.
Is HVAC Coil Corrosion a Cause for Concern?
Discovering that your HVAC system has developed coil corrosion will probably come as a surprise, and not a pleasant one. Corrosion in an HVAC system’s evaporator coil signals either a major repair or a system replacement. Heat pumps and air conditioners use an indoor evaporator coil and an outdoor condensing coil.