Ductless systems, also known as ductless mini-split systems, are heating and cooling units that do not require ductwork to distribute air. They consist of an outdoor compressor unit and one or more indoor air-handling units. This design allows for efficient temperature control in individual rooms or zones, making them ideal for homes without existing duct systems. These systems are energy-efficient and can help reduce energy costs compared to traditional central heating and cooling systems. They also offer flexibility in installation, as the indoor units can be mounted on walls, ceilings, or floors, providing various options to suit different spaces.