What does the acronym VRF mean in the context of air conditioners?
Variable refrigerant flow (VRF) is a highly efficient and flexible heating ventilation and air conditioning (HVAC) system that is ideal for large-scale air conditioning in commercial spaces due to its efficiency and flexibility.
Its flexibility comes from the fact that unlike split air conditioning, VRF allows multiple indoor units to run on the same system, which can be designed differently depending on the application, such as the number of indoor units used, or the capacity for heating and cooling.
VRF systems obtain their high efficiency through their independence from ducts, as leaky or unprotected ducts lead to a lot of wasted energy, and the use of inverter compressors. 
Compared to non-inverter systems that run at full capacity all the time, VRF systems can operate at lower speeds and capacities when demand is low, resulting in significant efficiency gains.
This means when a room is not in use, the VRF system can adjust the temperature and airflow to reduce energy consumption, whereas a non-inverter system would have to continue running at full capacity.
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