Bosch inverter ducted split systems provide efficient comfort by adjusting the operating speeds rather than a simple on/off control like other units, thereby reducing operating costs. These robust and durable units feature intelligent control and integrated sound dampening. Whether summer, or winter the system responds to maintain the desired home temperature. Only 2 outdoor units cover 2 thru 5 ton capacity when matched to indoor coils, or air handlers. Units pre-charged for 15 line set. Reversing valves energized in the heating mode. Units are 208/230 volts 1 phase.