Ductless Mini Split Air Conditioners are a fairly recent addition in the world of air conditioning systems. There are many types of mini split products available the most simple of which are single and multi-zone systems. Single Zone typically means a single room application. Multi-Zone typically means a system for a whole house or commercial space. In terms of function a mini split system is similar to a heat pump and fan coil combination but the end result is accomplished by locating the cooling / heating coil inside the area that needs to be cooled or heated.