The typical central air conditioning system is a split system, with an outdoor air conditioning, or “compressor bearing unit” and an indoor coil, which is usually installed on top of the hot air furnace in the home.
Using electricity as its power source, the compressor pumps refrigerant through the system to gather heat and moisture from indoors and remove it from the home.
Heat and moisture are removed from the home when warm air ducted through a “Return” from inside the home is blown over the cooled indoor coil. The heat in the air transfers to the coil, thereby "cooling" the air.
The heat that has transferred to the coil is then "pumped" to the exterior of the home, while theair is pumped back inside through “Registers” in the “Supply Air Duct System”, helping to maintain a comfortable indoor temperature.