The answer to 'how does ductless system work' is that a ductless, or mini-split, HVAC system does not require ductwork to distribute air throughout the home. Instead, it uses one or more wall-mounted indoor units connected to an outdoor compressor unit by refrigerant lines. Each indoor unit has its own thermostat, allowing for individual room temperature control. The outdoor unit circulates refrigerant to the indoor units, which then use fans to blow the heated or cooled air into the room.
Ductless systems are highly efficient and flexible, making them a popular choice for home additions, older homes without ductwork, or homes with hot spots that need supplemental cooling. They can also be a cost-effective alternative to window units or extending a central HVAC system.