What is the definition of a VRF heat pump? VRF, or Variable Refrigerant Flow, heat pumps are a type of HVAC system that is used in commercial buildings and large residences. They are highly efficient, as they use a variety of refrigerants to ensure that the exact amount of energy is used to provide the desired cooling or heating power. VRF systems are also known for being highly reliable, and they can operate for long periods of time with minimal maintenance. The primary benefit of a VRF heat pump is its ability to condition multiple zones simultaneously. It uses an inverter-driven compressor to control the flow of refrigerants, allowing it to provide heating or cooling to multiple rooms or floors at the same time. This makes it an ideal choice for large buildings, as it minimizes the need for separate systems in each room. VRF heat pumps are also beneficial because they are highly efficient and require less energy than traditional HVAC systems. As a result, they