A ductless system is a type of heating and cooling system that does not require the use of ducts to distribute air throughout a home or building. Instead, it uses individual air handlers that are mounted directly to the walls or ceilings of each room. Each air handler is connected to an outdoor unit that houses the compressor and condenser. The outdoor unit pumps refrigerant to the indoor air handlers, which then cool or heat the air in the room. The advantage of a ductless system is that it is more energy efficient than a traditional HVAC system because it eliminates the need for ducts, which can be a major source of energy loss. Additionally, it is easier to install than a traditional system and can be used to heat and cool individual rooms, allowing for greater control over the temperature in each room.