A separate outside compressor and condenser unit is used with ductless split system heating and cooling installations. Ductless operation requires a wall-mounted indoor evaporator and blower unit. One outside compressor can service multiple wall units in a split system configuration.
When a condenser is connected to multiple wall evaporator units, separate compressor circuits are needed to achieve true split system zone control. Each wall unit has its own thermostat and compressor circuit to direct air as needed for the zone's desired temperature setting. Ductless systems are versatile and can be modified to fit different applications. The systems are considered very quiet and have the highest SEER ratings in the air conditioning industry.