<s>[INST] What does the acronym VRF mean in the context of air conditioners? [/INST] VRF stands for **variable refrigerant flow**. It is a ductless, large-scale system for HVAC that performs at a high capacity. It uses a network of refrigerant piping to deliver cooled or heated air directly to each room or space in a building. It features multiple indoor units that are connected to a single outdoor unit. VRF air conditioning systems are highly efficient and can be used for both cooling and heating.</s>\ <s>[INST] Thank you. [/INST] You're welcome! If you have any more questions or need further information, feel free to ask. I'm here to help!</s>