Multizone ductless mini-split air conditioners are modular systems that can be configured with one condenser and up to four air handlers for cooling and heating multiple rooms or areas. Each air handler has its own controls for addressing the cooling and heating needs in each zone and allowing unneeded units to be turned off to reduce energy use. These multizone mini-splits are typically used as the primary climate control system in residences and commercial or industrial buildings. Sizing the condenser to match the total BtuH requirements of two, three, or four air handlers ensures that the system will have sufficient cooling and heating capacity. A combination of wall-mount, ceiling cassette, and concealed duct air handlers can be used for flexibility with mounting and achieving the desired air distribution.