The AOU45RLXFZ multi-zone split system is a high-efficiency, five-zone heat pump. The system permits connection of two to five indoor units to one outdoor condensing unit and offers operation of as much as 19.7 SEER and 10.3 HSPF. Users can control indoor units individually or use the optional central remote control. Wall-mounted, slim-duct, compact-cassette, or floor-mount indoor units in a variety of BTU/hr. sizes are available Mix-and-match flexibility of evaporator type and capacity provide a choice of an indoor unit that best fits the application. Single-port evacuation aids installation time. No branch boxes or separation tube assemblies are required.