What is the definition of a mini split with heat and air? A mini split is a type of heating and cooling system that is becoming increasingly popular in residential and commercial settings. It consists of an outdoor unit, usually located outside the building, and one or more indoor units connected to the outdoor unit via a conduit of refrigerant lines, electrical wiring, and drain lines. The outdoor unit houses a compressor, condenser, and expansion valve, while the indoor units contain evaporator coils. This type of system offers several advantages over traditional central air conditioning and heating systems. Firstly, mini splits are more energy efficient than their central counterparts, which makes them a great choice for conserving energy. Secondly, mini splits are relatively easy to install, since the indoor and outdoor units are connected with small refrigerant lines and electrical wiring. Lastly, mini splits offer a more flexible solution for zoning, as they allow different temperatures to be set in different areas of the home or building.