No project is too large for GREE. Our Super +Multi heat pump systems utilize G10 inverter technology to provide lower power consumption and quieter sound levels, while providing trouble free comfort. Gree's 2-port or 3-port BU Modules vary refrigerant volumes and allow one outdoor unit to connect to as few as 2 to a maximum of 8 (48,000 Btu/h) or 9 zones (56,000 Btu/h). The longer refrigerant line capabilities, of Super +Multi heat pumps, simplify system layout and offer much more flexibility locating indoor units.Features and Benefits: 2 port or 3 port BU Modules Sound Levels down to 57 DB Low Ambient Cooling down to 5 degree F Piping Length up to 140 ft. (48K model) and 475 ft. ( 56K model) Intelligent Defrost Multi-point Diagnostics R410A Refrigerant