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Auto, on, and on select models, circ (circulate). Web what do the fan auto vs. Web selecting the ‘on’ thermostat setting for your system’s fan tells the fan to operate all the time. The fan setting on your thermostat turn’s the blower in your hvac. On settings dictate how the hvac system’s. This means that the fan will. Web on your thermostat’s display, you’ll notice that the fan is set to either “auto” or “on.” what does that mean exactly? Web so, what does the fan setting on a thermostat do? Web the fan selection key has two or three positions: