Should I Set My HVAC Fan to Auto or On?

HVAC fan

It’s amazing how hard it can be to choose between two options. Most heating and cooling systems allow you to set your HVAC fan to run periodically or continuously. The Auto and On settings are there for a reason, but which one is better? Read our blog to make an informed decision.


The fan setting controls the blower motor, an important component of your HVAC system that distributes air throughout your home. Setting your fan to On means it will run continuously regardless of the temperature. This disperses air more evenly throughout your home. In addition, the blower motor won’t have to start up over and over again. Startup puts stress on the motor and may decrease its lifespan.

A fan pulls air through your system’s filtration or UV light system, so leaving it on may improve air quality for those with allergies. But with the fan always on and circulating air through the ductwork, you’ll lose more of the conditioned air your system creates.

Overall, setting your HVAC fan to On will cost you up to $50 dollars a month in electricity. Since it’s pulling air through the filter on a constant basis rather than periodically, you’ll have to check and replace the filter more often. That, combined with increased duct leakage and equipment wear, makes it more expensive in the long run.


Setting your HVAC fan to Auto is the most cost-effective option. Your fan will work with the heating and cooling system, running as often as needed. When the thermostat reaches the temperature setting, the whole system will turn off, blower included. With your blower fan cycling in various intervals, less air travels through your filter, so you won’t need to replace it as often.

Request service from our expert technicians if your blower motor goes out or you have any other HVAC trouble. We are here for you. Heating & Cooling Two offers a wide range of programmable and non-programmable thermostats that are easy to operate and give you complete control over your home’s heating and cooling. Rely on our energy efficient air conditioners to keep you cool this summer regardless of what fan setting you choose. We provide filters and other accessories that you can order through our secure online store. Contact us for more information.

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