What is the definition of a mini split unit AC and heat? A mini split unit is an air conditioning and heating system that consists of two main components: an outdoor condensing unit, and an indoor evaporator unit. The outdoor condensing unit contains the compressor, condenser, and an expansion device. The indoor evaporator unit contains the evaporator coil, a blower fan, and an optional air filter. Together, the two systems work together to provide heating and cooling for the home. The mini split system is most commonly used in homes that don’t have access to a duct system. This allows for more efficient and cost effective heating and cooling. The system is also beneficial for zoning, allowing users to control the temperature in different areas of the home. The mini split AC and heat unit is also often used in areas where the climate is difficult to control, such as in places that experience extreme heat or cold. Mini split AC and heat units provide a great way to effectively