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I was going to recommend adding a second HVAC thermostat upstairs too, but you said you only wanted to control the fan motor, not AC or heating, so instead I suggested adding a separate fan-controlled thermostat circuit upstairs.
I don't think adding a second thermostat will automatically switch the fan ON without also delivering cool or heated air.
Confirm this action using your primary HVAC thermostat.
Sherwood
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