Thru the wall AC works just like any other type of air conditioning unit. It utilizes refrigeration cycle as a technique of lowering the temperature of a room. To explain further, evaporation and condensation methods are used in this system. In order to cool down a room, the air conditioning unit begins by transforming cool low pressured gas into warm and high pressured gas vapors. The warm gas then passes through a series of coils where it is then diffused with its heat scattered thereby cooling it. This will then transform the gas into liquid and is then passed through an expansion value which will then turn it into cold vapor.

The cold vapor is then again vented out through another set of coils. A blower or fan expels this cold vapor into the room. Once cold vapor is scattered into the room it will then absorb the warm air. The cold vapor is then sucked it the unit through a filter thereby cycling the whole process over again. This continuous cycle eliminates the heat from of the room. The ambient air is then cooled off for circulation.

Thru the wall ACs have vents located on both ends of the unit in order that the air inside the room is blown in and out by the blower of the unit. The outdoor vent of the air conditioner acts like a heat sink. Thru the wall AC regulate and control the temperature of the room through a control device; in most cases through an infrared remote control device.