The answer to 'what does ductless system do' is that a ductless HVAC system, also known as a mini-split system, is a type of air conditioning and heating system that does not require the use of ductwork to distribute conditioned air throughout a home. Instead, ductless systems use one or more wall-mounted indoor units connected to an outdoor compressor unit by refrigerant lines.
Ductless systems are highly efficient and flexible, allowing homeowners to control the temperature in individual rooms or zones. They are a popular choice for homes without existing ductwork, additions, or spaces that are difficult to heat and cool with a traditional central HVAC system. Ductless systems are also a good option for homes with high energy costs, as they can provide targeted cooling and heating where it's needed most.