Variable Refrigerant Flow (VRF) systems are advanced HVAC solutions that provide precise temperature control across multiple zones in a building. By using a single outdoor unit connected to multiple indoor units, VRF systems adjust the flow of refrigerant based on the cooling or heating demand of each zone, allowing for energy-efficient operation. Indoor units come in various types, including wall-mounted, ceiling-mounted, ducted, and cassette units, offering flexibility in installation to suit different space configurations. VRF systems are commonly used in commercial buildings, offices, hotels, and large residential complexes due to their quiet operation, space-saving design, and the ability to provide both heating and cooling simultaneously in different zones. They offer a highly efficient and customizable climate control solution.