Because of their power, PTACs best suited for the conditioning of one room or part of a room. Air enters directly into the room through the decorative discharge grille.

PTAC units slide into the wall sleeve, which is mounted in the outer wall of a building during construction. Electrician provides vessel, as appropriate for the device. As a rule, installation of the unit involves simply by sliding it on his sleeve and connect it to an electrical outlet. Some devices are connected to a power source, however.

Heating capacity in these units to avoid the need for a separate heating system. Electrical resistance of a heat transfer and heat pump models are available. In addition, steam or hot water coil may be available. This coil would connect to a separate boiler room.

Heat pumps, which absorb heat from outdoor air during its cycle of heating and movement, heat the air in the room called air or air heat pumps. They are called "Air " Source", because the air is the source of heat. They are called "air-air", as they absorb heat from outdoor air and reject it to the air. Air heat pump version PTAC popular equipment.

..