A split unit is a type of air conditioning system that consists of two separate components: an indoor unit and an outdoor unit. The indoor unit is typically installed in the living space, while the outdoor unit is installed outside. The two units are connected by refrigerant lines, which allow the system to move heat from the inside to the outside. The indoor unit is responsible for cooling the air inside the living space, while the outdoor unit is responsible for releasing the heat outside. Split units are typically more efficient than traditional window units, as they are able to cool a larger area more effectively. They are also quieter than window units, making them ideal for bedrooms and other areas where noise is a concern. Split units are becoming increasingly popular as they offer a more efficient and cost-effective way to cool a home.