When configuring the fan setting on your Honeywell thermostat, choosing between Auto and On depends on your airflow preferences. Setting the fan to Auto ensures the blower motor runs only when your heating or cooling system is actively cycling, saving electricity. Setting the fan to On forces the blower motor to run continuously 24/7, which provides constant air filtration and equalizes temperature stratification across multi-story homes, though it increases monthly utility costs. Verification: Check the fan status icon on your thermostat display to confirm whether the blower operates continuously or only during active HVAC cycles.
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