It is an internal machine corresponding to an external machine. It is relative to the integral air conditioner. The integral air conditioner is an integral machine without internal or external machine. The split air conditioner has wall hanging type, vertical cabinet type, ceiling type, embedded type and floor type. Separate air-conditioning can also be divided into separate wall-hanging air-conditioning and split cabinet air-conditioning. Generally speaking, the installation location of split wall-mounted air conditioning is limited, easy to match with indoor decoration, has super quiet working characteristics, low noise, multiple purification functions, easy operation, beautiful and generous, suitable for general family use.