Facts:

• A typical central air conditioning system is a split system, with an outdoor condenser,  and an indoor coil, which is usually installed on top of the furnace or in an air handler within the home.
• Using electricity as its power source, the compressor pumps refrigerant through the system to pick up heat and moisture from indoors and remove it from the home.
• Heat and moisture are removed from the home when warm air from inside the home is blown over the colder indoor coil extracting the warmer air. 
• The heat that has extracted through the coil is then "pumped" to the condenser where it's then exhausted to the outside air.
•  A central air conditioning can also be provided through a package unit or a heat pump.

Benefits:

•  More comfortable indoor air during warm humid weather - Central air conditioning helps keep your home cooler and reduces the humidity levels.
• Cleaner air - As your central air conditioning system draws air through the returns rooms in the house, the air is pulled through an air filter, which removes airborne particles such as dust, dander, and lint. A more sophisticated air filter may remove microscopic pollutants, as well. The filtered air is then routed to air supply ductwork that carries it back to rooms.
• More quieter operation because the condenser unit is located outside with the compressor and condenser fan, the indoor noise level is much lower than that of a window air conditioning unit.