Ductless Air Conditioner
A ductless air conditioner is useful for buildings where ductwork cannot be installed or would be prohibitively expensive. Like through-the-wall air conditioning units, ductless air conditioners are impractical for cooling very large areas, but they quiet and easy to install for buildings without existing ductwork.
Ductless air conditioning splits the difference between through-the-wall and central types of air conditioning. In a ductless air conditioner, an outside unit with the compressor is mounted on an exterior wall, while an inside unit with the evaporator is mounted on an interior wall or ceiling.
Ductless air conditioners are able to cool larger areas than window air conditioners because multiple evaporators can be connected to a single compressor. For this reason, ductless air conditioners are popular in homes and retail stores. They also are able to keep different rooms cooled at different temperatures.