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Window air conditioners are single, self-contained units that exhaust heat and humidity from the room to the outside.
They have louvers on the back and sides that bring in fresh air. The air runs through coils, which are cooled by the compressor using refrigerant, and then the fan pushes the cool air back into the room.
Air conditioners installed into a wall function the same as window air conditioners: they are single, self-contained units that exhaust heat and humidity from the room to the outside. Louvers (located on either the back or the back and sides of the unit) bring in fresh air.
The air runs through coils, which are cooled by the compressor using refrigerant, and then the fan pushes the cool air back into the room. They fit through a hole in an exterior wall, and are generally used to cool a single room. You must install a sleeve in your wall to support the weight of the unit.
Portable air conditioners offer more flexibility than other window or through-the-wall air conditioners. Portable air conditioners have wheels and are compact (usually 2'–3' tall). Condensation is either collected in a bucket, redistributed through a hole, or recycled through the air.
Even though portable air conditioners are easily moved, the hot air needs to vent to the outside. A hose, usually 3" to 5" in diameter, attaches to the air conditioner then vents through a window, sliding door, wall or ceiling.