That depends on how many rooms need to be conditioned. For a single-room addition with exterior walls and windows, a window, through-the-wall or single zone ductless split installation is a good choice. For multi-room additions, or if you don't have windows or exterior walls, consider a ductless split system. Like a central air conditioner, ductless split systems are two-piece systems with one part outdoors and one (or multiple) indoor units that distribute the conditioned air. Indoor units typically mount high on a wall or, occasionally, in the ceiling or on the floor. Multi-zone ductless systems can condition up to four spaces with one outdoor condensing unit. For more information, see our product detail pages for
Window Units,
Through-the-Wall Units, or
Ductless Split Systems.