Here in Florida our highest energy cost is air conditioning our homes. Central air conditioning systems are highly complex with many various parts. In most situations you have the unit outside the home which is the compressor and cooling fan. Somewhere inside the home, often in the garage or attic is the second part referred to as the air handler. Within this unit is an inverted V shaped piping system known as the cooling coils. There also is a fan and blower motor inside this unit.