What is the definition of a VRF package unit? A variable refrigerant flow (VRF) package unit is a type of heating, ventilation, and air conditioning (HVAC) system that is cost-effective, energy-efficient, and able to maintain comfortable temperatures in a wide variety of spaces. Unlike traditional HVAC systems, which use a split system design, VRF package units use a single outdoor unit that contains all the necessary components for the system. This single unit is connected to multiple indoor units throughout the area being cooled, allowing for zoning and individual temperature control. VRF package units are also known for their flexibility, as they can be easily modified to accommodate changes in the size of the space or other desired features. Additionally, they are often used in commercial and industrial applications, as they provide a high level of energy efficiency and can be easily adapted to multiple levels of usage. With their combination of cost-effectiveness, energy-efficiency, and flexibility, VR