A Variable Refrigerant Flow (VRF) HVAC system is a type of air conditioning system that uses a variable refrigerant flow to provide cooling and heating to multiple zones in a building. It is a modern, energy-efficient alternative to traditional HVAC systems, as it uses a single outdoor unit to provide heating and cooling to multiple indoor units. The VRF system works by using a refrigerant to transfer heat from one area to another, allowing the user to control the temperature in each zone independently. This makes it an ideal choice for buildings with multiple rooms, as it allows for individual temperature control in each area. Additionally, the VRF system is highly efficient, as it uses a single outdoor unit to provide heating and cooling to multiple indoor units, resulting in less energy consumption and lower utility bills.