Each +Multi heat pump is powered by Gree's energy efficient G10 inverter and a variable speed compressor. These units can heat and cool up to 5 zones without distribution boxes. Our G10 inverter technology saves energy, reduces outdoor noise and keeps room temperature steady by eliminating the harsh starts & stops of conventional systems. Each outdoor coil has a corrosion resistant Gold Fin coating to promote energy efficiency and prevent coil corrosion in corrosive environment. Heavy Gauge Steel Cabinet Indoor Master/Slave Settings Multipoint Diagnostics Sound Levels down to 56 DB No Refrigerant Distribution Boxes R410A Refrigerant Low Ambient Cooling down to 5 degree F Multi Condensate Ports Multi Zone Inverter Heat Pump