What is the definition of a VRF unit? VRF stands for Variable Refrigerant Flow and is a type of unit that helps to regulate the flow of refrigerant through an HVAC system. It is a very efficient system, as it is able to adjust the flow of refrigerant depending on the temperature and other conditions in the space. The VRF unit works by using compressors to transfer refrigerant between indoor and outdoor units in order to heat or cool a space. The indoor and outdoor units typically consist of multiple evaporators, condensers, and reversing valves. The reversing valve is the key component that allows the system to switch between heating and cooling modes. In a VRF system, the amount of refrigerant flowing through the system is controlled by an advanced algorithm or computer system. This helps to ensure that the system is running efficiently and that the space is comfortable. The VRF units are increasingly popular in larger buildings, such as commercial and industrial buildings, due to