Should I set my Thermostat to ON or AUTO? 


Mar 12, 2018 | General HVAC

Setting Your Thermostat

Heat, Cool and Off are the straightforward settings of one switch on many thermostats. But what about the other switch, On or Auto? What’s the difference? On means the fan is going to run continuously, 24/7. Auto means that the fan will only run while the system is actively heating or cooling the air. The setting you use can depend on a number of factors, and ultimately your personal preference. Here’s some basic information to get you thinking about a strategy that works best for you and your family.

Pros of On Setting:

More air circulation means cleaner air. Since the air is running through a filter, this setting may be better for family members that suffer from allergies or asthma. Leaving it On means less starts and stops for the fan, and may prolong the life of your fan.

Cons of On Setting:

Since the air is getting filtered more, you’ll need to check and replace your filter more often. The On setting is going to be more expensive. You will probably notice a difference in your monthly energy bill. In the winter it might feel like cold air is coming through the vent. It only seems cold compared to your body temperature. It’s not cold air. It’s the temperature set on your thermostat, and it’s not actively being heated.

Pros of Auto Setting:

The fan runs less often, as it will only run while the air is actively being heated or cooled. This is more energy efficient and may result in a lower monthly energy bill. Auto is the setting that most homeowners use.

Cons of Auto Setting:

More starts and stops for your fan may shorten the life of your fan in the long run. In general you’ll get less air circulation in your home if you leave it on the Auto setting.

Try a combination of Both:

Set it On when you are at home during the day. Then, turn it to Auto at night or when you are away. With this strategy you will enjoy the benefits of better air circulation while you are home, and the cost saving of only using the fan when the systems needs to while you are sleeping, or away. Consult with the experts at Ballard Natural Gas Service to decide which setting best suits you and your family.

If you are in Seattle or the greater Seattle area request service online and if you are not sure if you are in our service area, check out our service area page for more information on the communities we serve.


Ballard Natural Gas Service is proud to offer services to Seattle, Shoreline, West Seattle, Capitol Hill, Lake Forest Park, Richmond Beach, Bellevue, Mercer Island, Edmonds, Mountlake Terrace and the surrounding communities. Call us at 206-784-8101 or request service online today!

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