A ductless split system is a type of air conditioning and heating system that does not require the use of ducts to circulate air throughout a home or building. Instead, these systems use individual air handlers that are mounted on the walls or ceilings of the home or building. Each air handler is connected to an outdoor condenser unit, which is responsible for the cooling and heating of the air. The air handlers are also connected to a thermostat, which allows the user to control the temperature of the air. The advantage of a ductless split system is that it is more energy efficient than traditional air conditioning and heating systems, as it does not require the use of ducts to circulate air. Additionally, ductless split systems are more flexible than traditional systems, as they can be used to cool and heat specific areas of a home or building. This makes them ideal for homes or buildings with multiple rooms or levels, as each area can be cooled or heated separately.