Ductless mini-split systems offer a compact heating and cooling technology that’s ideal for cottages in several ways. Besides making your cottage comfortable during cold and hot seasons with just the push of a button, mini-splits don’t need ventilation ducts. With mini-splits, the components are separated: the compressor is mounted outdoors, while the heating/cooling unit is indoors, mounted on a wall. When mini-splits first came out, they were for cooling only.