A portable AC unit is an air conditioner that can easily be moved from room to room as needed. It typically has wheels and features a lightweight construction.
A portable air conditioner does not need to be installed; it sits on the floor and plugs directly into an electrical outlet. Because an air conditioner needs to expel hot air outdoors in order to cool the air, a portable model is equipped with a tube that is placed through an opening in the room, such as a window or mail slot. A portable air conditioner usually uses less energy than a central air conditioning system, especially when only a small space needs to be cooled.