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

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

The “auto” setting is preferred, as well as the most used and most efficient setting. In this setting, the fan will only operate when the temperature requires it. There are advantages, however, to using the “on” setting. In this setting, air is constantly filtered through your unit’s air filter, and constantly circulating air results in even temperatures throughout your home.