Split-zoning systems allow each room (or space) using an individual indoor air-handler to be controlled independently from other rooms, thus providing individualized comfort control within each room of a home.
Ideal applications for a split-zoning system include bedrooms, garages, or bonus rooms, just to name a few.
There is little to no ductwork required so you don't have to worry about
disorder in your home interrupting your life or costly remodeling expenses. The sleek indoor unit mounts discreetly within the space, and a pair of refrigerant lines plus power and control wiring connect it to the outdoor unit through a small opening in the wall.
Information courtesy of http://www.mitsubishicomfort.com/en/consumer/how-it-works