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Variable Refrigerant Flow (VRF) systems are advanced HVAC (Heating, Ventilation, and Air Conditioning) technologies that utilize a single outdoor condensing unit to connect to multiple, individually-controlled indoor units via refrigerant piping, fundamentally replacing large ductwork and chiller-based systems. The core of a VRF system is its inverter-driven compressor, which dynamically controls the precise amount of refrigerant flowing to each indoor unit based on the real-time heating or cooling demand of that specific zone. This variable flow capability, managed by sophisticated control algorithms, ensures that the system only consumes the exact amount of energy needed to maintain the desired temperature in each space, leading to significant energy efficiency (especially at part-load conditions), quiet operation, and the ability of Heat Recovery VRF systems to provide simultaneous heating and cooling in different zones of the same building by recycling waste heat.