How Often Do You Need to Change the Air Filter on Your Heating and Cooling Systems?
Most disposable air filters last three to 12 months. Life span varies by model, but in general, the thicker the filter, the less often it needs changing. But the filter thickness you use is dictated by the type of heating and cooling system(s) you have.
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Editor’s Note: A version of this article also appeared in the November/December 2023 issue of Consumer Reports magazine.