A split system air conditioning (AC) unit is a type of cooling system that is made up of two separate components: an outdoor unit and an indoor unit. The outdoor unit contains the compressor, condenser, and fan, while the indoor unit houses the evaporator and expansion valve. The two units are connected by refrigerant lines that allow the refrigerant to flow between them. This type of system is the most common type of air conditioning system found in residential and commercial buildings. It is a great choice for cooling large areas, as it can provide more efficient cooling than a single unit system. The split system AC unit is also more energy efficient than a window unit, as it is able to better regulate the temperature in the room. The split system AC unit is also more cost effective, as it does not require the installation of a duct system. Overall, the split system AC unit is a great choice for cooling large areas, as it is energy efficient, cost effective, and easy to install.