A Variable Refrigerant Flow Heat Pump (VRF) is a type of HVAC system that uses refrigerant as its cooling and heating source. It works by varying the flow of the refrigerant to different parts of the building, allowing for the most efficient and cost-effective temperature control. The system is composed of two main components: an outdoor unit that contains the compressor, condenser and evaporator, and an indoor unit that is connected to the outdoor unit and contains the fan, coil and motor. The refrigerant is circulated between the outdoor and indoor units, and the amount of refrigerant is controlled by a thermostat, allowing the user to adjust the temperature as needed. The advantage of a VRF system is its ability to efficiently heat and cool multiple areas of a building, as the flow of refrigerant can be adjusted to different parts of the building depending on the temperatures desired. This type of system is especially useful in large buildings or facilities that contain multiple rooms that