Ductless AC, or a mini-split air conditioning system, works by connecting an inside blower unit directly to an outside condenser unit. These units are connected with electrical wiring and refrigerant tubing through a hole in an exterior wall.
The inside unit is mounted to a wall or a ceiling and cools a specific room or area of your home. Ductless air conditioning is similar to the old window air conditioners. But instead of taking up valuable window space, mini-splits are discrete and less noisy.