This type of cooling system is used to cool the entire home, versus a window air conditioner that is used to cool a specific area or room of your home. The cooling compressor is set outside the home, separate from the fan unit used to blow the cool air throughout the home on the central air unit, unlike the window air conditioner that utilizes everything within one concealed unit. By using the existing heating/cooling ducts that encompass the entire home, the central air unit can cool the entire home evenly. The coil that is placed outside of your home is called the condensing coil. It consists of a compressor, condensing coil condenser fan, a grill to protect persons from coming into contact with the fan blade, a case built around all of the components, controls, and two refrigerant lines that run into the home to the evaporator coil.
Warm air from the inside of your house is pulled into ductwork by a motorized fan. The refrigerant is pumped from the exterior compressor coil to the interior evaporator coil, where it absorbs the heat from the air. This cooled air is then pushed through connecting ducts to vents throughout the home, lowering the interior temperature. The refrigeration cycle continues again, providing a consistent method to keep you cool.
To get a better sense of how your air is cooled, it helps to know a little bit about the parts that make up the air conditioning system. A typical central air conditioning system is a two-part or split system that includes: The outdoor unit contains the condenser coil, compressor, electrical components and a fan. The evaporator coil, which is usually installed on top of the gas furnace inside the home. A series of pipes, or refrigeration lines, connecting the inside and outside equipment. Refrigerant, the substance in the refrigeration lines that circulates through the indoor and outdoor unit. Ducts that serve as air tunnels to the various spaces inside your home. A thermostat or control system to set your desired temperature.