Multi-unit air conditioning refers to the kind of an external machine can drag more than one internal air conditioning, usually an external machine to drag up to 16 sets of internal machines, each internal machine can be started separately, 16 sets of external machines can be merged into a group, controlled by a central controller. This type of air conditioning units, especially hotels or rich families will choose
Precision air conditioning refers to the machine room with constant temperature air conditioning, control system is complex, expensive, usually only more important electronic equipment room will be used.