Should I Keep My AC on “Auto” or “On”?

Donnie Rowe AC Repair & Installation in KentuckyEvery thermostat usually has two different controls for controlling the heating and air conditioning system in your home. For instance, if you desire higher temperatures, you set your system to heat, and when you want low temperatures, you set it to gradually cool. Sometimes, you may also want it off. However, most homeowners don’t know the difference between the “on” and the “auto” mode of their thermostats. Let us start by examining the primary purpose of your AC fan.

The Function of AC Fan
Typically, when you set your AC fan to “on” or “auto” mode, you are changing the way the HVAC system distributes air within your home. When the air conditioner runs, it is the work of the fan to help the cooled air reach all the air registers installed in various parts of your home. Although the “on” and the “auto” settings do not necessarily affect the cooling capabilities of your AC unit, one is more energy-efficient compared to the other.

The “ON” Mode
In the “on” mode your fan will run continuously regardless of the temperature setting on your thermostat. This means that air is continuously being cycled through the filters. Technically, the fan in your home will be running 24/7 even when the air isn’t being heated or cooled. Keep in mind that your fan utilizes a few hundreds of watts of energy but has a minimal impact on the overall comfort level of your home. The overall result of leaving your thermostat setting in “on” mode is that you will end up pay more when it comes to your energy bill. The furnace filter will also clog faster.

The “AUTO” Mode
The “auto” mode means that the fan will only run when the furnace tells it to run during heating, the system fan is usually controlled either by a limit circuit or timer circuit installed within the fan. The fan will start about 45 seconds after the burners light and will automatically go off about 45 seconds after the desired temperature is achieved. On cooling, your fan will only run when the AC is running.

One of the most significant advantages of the “auto” mode is that it is more energy-efficient compared to the “on” setting. You will save a lot of money since the fan only runs when your home is in a heating or cooling cycle. There are certain times when the fan is completely off and doesn’t consume any energy. However, the primary disadvantage of the “auto” mode is that it goes through many starts and stop cycles which can cause severe wear of the fan over time.

Donnie Rowe Heating & Air Conditioning offer the best AC and heat repair services in Lexington. Contact us today and let us fix your HVAC system so that you enjoy a comfortable home throughout the year!

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