A ductless mini-split system 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 use refrigerant to transfer heat between the indoor and outdoor units. They are known for their energy efficiency, as they can provide both heating and cooling without the energy losses associated with traditional ducted systems. Additionally, they often operate quietly, making them a popular choice for residential and commercial spaces.