A ductless mini-split uses a small outdoor heat pump connected to one or more indoor "heads" via small refrigerant lines passing through a 3-inch hole in the wall. Each head — wall-mounted, ceiling cassette, or low-wall floor unit — has its own thermostat for true room-by-room zoning.
Mini-splits are heat pumps (both heating and cooling). Multi-zone configurations can run 4-8 indoor heads off a single outdoor unit.
Best fit: additions, sunrooms, garages, ADUs, and historic Charleston homes where adding ductwork would require destroying plaster walls. Not the right tool when you already have working ductwork serving the whole house.
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