Split air conditioners have a split design with an external or out door unit that houses the compressor and one or more internal units that are served by the compressor and house the air handlers. Their design makes them similar to central air conditioning units however the fact that they use smaller air ducts makes them less expensive and easier to install..
In a split air conditioner the refrigerant is pumped to the cooling coil in the air handlers through the ducting. The conduit which just needs a three inch hole drilled in the wall connects the inner and the outer unit. It houses the refrigerant and suction tubing, the condensate drain and the power cable.
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