A ductless split system air conditioner is a type of air conditioning system that does not require the use of ducts or vents to circulate cool air throughout a space. Instead, it uses a series of small, individual units that are mounted on walls or ceilings. Each unit is connected to an outdoor condenser unit, which pumps refrigerant to the indoor units to cool the air. This type of air conditioning system is ideal for smaller spaces, such as apartments, where installing ductwork is not an option. It is also a great choice for homes that have rooms that are not used often, as the individual units can be turned off when not in use. Ductless split system air conditioners are also energy efficient, as they only cool the rooms that are being used, and they do not waste energy by cooling unused spaces.