A small split unit AC is a type of air conditioning system that is composed of two separate units, an outdoor unit and an indoor unit. The outdoor unit is responsible for condensing the refrigerant, while the indoor unit is responsible for circulating the cooled air into the room. This type of air conditioning system is ideal for small spaces such as apartments, condos, and single-room dwellings, as it is more efficient and takes up less space than a traditional central air conditioning system. It is also easier to install and maintain than a central air conditioning system. Additionally, the small split unit AC is more energy efficient than other types of air conditioning systems, as it only cools the room it is installed in, instead of cooling the entire house.