How Long Does a Furnace Filter Last?

By HVAC.com on March 30, 2015

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A furnace filter can be good for a month, three months, six months or even up to a year depending on the type of filter and the quality of the air in the home or office. If you aren’t sure how often to replace your specific brand and type of filter, please contact our customer support team at 855-932-4822.
For a loose frame of reference refer to this chart:
Furnace Filter Size Months
1″ Furnace Filter 1 – 3 Months
2″ Furnace Filter 1 – 3 Months
3″ Furnace Filter 6 – 9 Months
4″ Furnace Filter 6 – 9 Months
5″ Furnace Filter 9 – 12 Months
6″ Furnace Filter 9 – 12 Months

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