A ductless mini-split is a type of heating and cooling system that does not require ductwork. It consists of an outdoor unit and one or more indoor units, which are mounted on walls or ceilings. This design allows for flexible installation and efficient temperature control in individual rooms or zones. These systems are known for their energy efficiency and quiet operation. They use a refrigerant to transfer heat between the indoor and outdoor units, providing both heating in winter and cooling in summer. Ductless mini-splits are popular in homes without existing ductwork or in spaces that require additional climate control.