Ductless air conditioners are an affordable alternative to window air conditioners and is ideal for use in older homes where installing ductwork can be difficult and expensive. The design features a small, rectangular wall-mounted indoor unit and a separate compressor section that sits outside the room. Benefits include no loss of window space or light and quieter operation since the compressor is outside.
Ductless mini split air conditioners combine the zoning flexibility of a conventional room unit (a single air conditioner installed through a wall or a window frame) with the whole house cooling potential of central systems. Another common term for ductless split systems is "mini splits." The advantages of ductless split systems over room and central air conditioners are: easy installation, quiet operation, versatility in zoning and design, and security. The split systems also eliminate the loss of cool air as it passes through the ductwork. Ductless air conditioners operate very quietly, since the compressor is outside and the evaporator unit's fan generally runs at a low speed. Variable speed high efficiency fans are also available. By providing zone cooling, ductless air conditioners save energy, since only the rooms that are occupied need to be cooled.