Variable refrigerant flow, or VRF, is a term that describes how this system uses refrigerant to provide both cooling and heating. VRF, to put it simply, is a highly effective, ductless, large-scale HVAC system.

In contrast to split AC equipment, VRF permits the operation of multiple indoor units on a single system, which is tailored to the application in question. The simultaneous heating and cooling capability of VRF systems makes them either heat pumps or heat recovery system