The answer to 'difference between ductless system and' is that ductless (or mini-split) HVAC systems do not require ductwork, unlike traditional central air conditioners and furnaces. Ductless systems have an outdoor compressor/condenser unit and one or more indoor air-handling units connected by refrigerant lines, allowing for targeted heating and cooling in specific rooms or zones. This makes them a good option for homes without existing ductwork or for additions and renovations where installing ductwork would be difficult or expensive.
Ductless systems are generally more energy-efficient than ducted systems since they avoid the energy loss that can occur in ductwork. They also offer more flexibility in placement and zoning, allowing you to heat or cool only the rooms you're using. However, ductless systems can be more expensive to install upfront compared to central HVAC, especially if multiple indoor units are required.