What is a COIL and do I have to have one?
Coil – a network of tubes filled with refrigerant that looks a lot like the radiator in your car. A coil located inside the home takes heat and moisture out of the air as liquid refrigerant evaporates. Sometimes called the cooling or evaporator coil. (See also Condenser) If you have or want Air Conditioning in your house, you must have a coil installed.
