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 CabinetIndoor Master/Slave SettingsMultipoint DiagnosticsSound Levels down to 56 DBNo Refrigerant Distribution BoxesR410A RefrigerantLow Ambient Cooling down to 5 deg FMulti Condensate Ports