A variable refrigerant flow (VRF) system, also known as variable refrigerant volume, is an HVAC system for heating and cooling multiple zones in a building from one single outdoor unit. VRF systems are becoming increasingly popular for both commercial and residential applications because they offer greater flexibility and energy efficiency compared to traditional ducted or ductless sy... https://prachicmi.livepositively.com/vrf-systems-an-overview-of-variable-refrigerant-flow-hvac-technology/new=1