What is The Definition Of A Multi Split Ac? A Multi Split Ac is an air conditioning system that is composed of two or more indoor units connected to one outdoor unit. This system allows you to control the temperature of each room independently, enabling you to maintain different temperatures in different areas of your home or business. This is especially useful if you want to create different temperatures in different rooms, such as bedrooms or living areas. The Multi Split Ac system is a great way to cool multiple rooms at once, and can be used for both residential and commercial applications. The outdoor unit of the system utilizes a compressor and condenser to cool air, which is then distributed through a series of ducts connected to the indoor units. The indoor units house fans, which help to disperse the cooled air to the desired location. The installation of a Multi Split Ac system requires special knowledge and skill, so it is best to have a professional install and maintain the system.