The definition of an air condition split unit is a type of air conditioning system that consists of two separate components: an outdoor unit and an indoor unit. The outdoor unit contains the compressor, condenser, and fan, while the indoor unit contains the evaporator and expansion valve. The two units are connected by refrigerant lines, which transfer the cooled air from the outdoor unit to the indoor unit. This type of air conditioning system is often used in residential and commercial buildings, as it is more efficient than a single unit system and allows for more precise temperature control. Additionally, the split unit system is more aesthetically pleasing than a single unit system, as the outdoor unit can be installed away from the building, allowing for a more aesthetically pleasing look.