Should a thermostat be set to the “auto” or “on” position?

They should preferably be set to an auto position. In heating and cooling equipment, when the fan is set in auto position, the fan will operate automatically when the unit is run. This is the most used and the most common setting in any equipment. However, there is another option, the “on” setting. In this position, air constantly circulates in the building and filters air through the unit’s air filter.

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