The 4MXW38 ultra high-efficiency high wall indoor unit works as part of a ductless mini-split or multi-split system. This model offers a capacity of 9–24 MBH, cooling efficiency up to 38 SEER, heating efficiency up to 15 HSPF, and low ambient heating down to -22F. Mounted on the wall, this unit offers flexible, high-efficiency heating and cooling for quiet, precise comfort without the ductwork. Temperature settings can be managed via a handheld remote control and traditional wall-mounted digital controls for the system. Includes Energy Star® qualified options. This model is also available as a heat pump only.