Which 21.5" x 23.5" x 1" filter best fits your needs?
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Regularly replacing your air filter will help improve the efficiency and longevity of your furnace.
Save Your Furnace Tip #12:
Install a thermostat with a filter change feature. Some thermostats can be configured to keep track of either calendar days or system run time and display a message when it’s time to change your filter, humidifier water pad, or UV bulb.