What is the definition of a multi split air conditioner? In the simplest terms, a multi split air conditioner is an air conditioning system that utilizes multiple indoor evaporator units connected to one outdoor condenser unit. This type of system provides the user with more options and flexibility than traditional air conditioning systems, as it allows the user to control the climate in different areas of their home or office independently. Multi split air conditioners also tend to be more energy efficient, as they can be run at different temperatures in different areas of the building. Additionally, since each indoor unit operates independently, the user can customize their climate control in each area without interfering with the other areas. This makes multi split air conditioners ideal for offices, homes, and other types of buildings. In general, a multi split air conditioner is an efficient and cost-effective way to customize the climate of different areas of a building, making it an ideal choice for anyone looking for a more flexible air conditioning system.