Ductless heat pumps are also called mini split heat pump systems. This type of system provides air conditioning and it can be more efficient than conventional air conditioners. It does not even require ductwork. It consists of an outdoor compressor unit and one or more indoor air-handling units, which are called heads. A refrigerant line links this. The indoor heads are usually mounted high on the wall or ceiling where the refrigerant line passes through to the outside unit, which is usually mounted at the base of the house. The indoor head is usually corresponded with a heating and cooling zone that can be controlled independently.