The answer to 'what does ductless system do' is a ductless HVAC system, also known as a mini-split system, is a type of air conditioning and heating system that does not require ductwork to distribute air throughout the home. Instead, it uses individual indoor air handling units connected to an outdoor compressor unit by refrigerant lines.
Ductless systems offer several benefits for homeowners, including improved energy efficiency, flexible zoning capabilities, and easier installation compared to traditional ducted systems. They are a popular choice for homes without existing ductwork, additions, or rooms that are difficult to heat or cool with a central system.