How do mini-split systems work?
With a ductless mini split system, the air source heat pump can run in “reverse”, supplying hot air in the winter and cool air in the summer. If you’ve ever waved your hand over your AC unit outside on a hot day while it’s cooling your house, you probably noticed the outdoor unit was blowing hot air. During cold weather, the heat pump component reverses this cycle to move this heat into the house.
The hook-up between the outdoor and indoor units generally requires only a three inch hole through a wall for the conduit. A homeowner can locate the outdoor unit as far as 50 feet away from the indoor evaporator. This makes it possible to cool rooms on the front side of a house but locate the compressor in a more inconspicuous spot on the side of the building.