Like the central air conditioner units, mini split air conditioners have two main components: an outdoor compressor/condenser, and an indoor air-handling unit. A conduit, which houses the power cable, refrigerant tubing, suction tubing, and a condensate drain, links the outdoor and indoor units through a small hole (3 inches usually) that is drilled in the wall of the building. The main advantages of mini split air conditioners are their small size and flexibility for zoning or heating and cooling individual rooms.
Some split air conditioners can have as many as four indoor air handling units (for four zones or rooms) connected to one outdoor unit. The number depends on how much heating or cooling is required for the building or each zone (which is also affected by how well the building is insulated). Since each of the split air conditioner zones/rooms will have it's own thermostat, you only need to condition that area when someone is present, which saves energy and money.
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