The smallest split unit AC is a type of air conditioning system that is designed to be as compact as possible. It is typically used in smaller spaces, such as apartments, dorm rooms, and other areas where space is limited. This type of AC unit is usually mounted on the wall or ceiling and is composed of two separate units: an indoor unit and an outdoor unit. The indoor unit contains the evaporator coil, the condenser coil, and the fan. The outdoor unit contains the compressor, the condenser fan, and the expansion valve. The two units are connected by refrigerant lines, which allow the refrigerant to flow between the two units. The small size of the split unit AC makes it an ideal choice for smaller spaces, as it takes up less space than a traditional window unit. Additionally, the split unit AC is more energy efficient than a window unit, making it a more cost-effective option.