Add Yahoo as a preferred source to see more of our stories on Google. A man kneels while pulling a dirty filter out of a furnace - Backyardproduction/Getty Images Changing your furnace filter is one ...
The Family Handyman on MSN
How to Change a Dirty Furnace Filter
If you’re thinking you only have to change your furnace filter once a year, you may be shortening the life of your furnace.
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