What is a portable AC unit? 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. Ductwork installation is the process of putting the network of tunnels that run from an air conditioner and furnace to the vents in each room. Why is the air conditioner blowing cold air, but the room is not cooling down?Cleaning part of the unit is sometime... What is a gas furnace flame sensor? Why does a Bryant furnace make a noise?