Q: I turned on my furnace for the first time this year, and it made the whole house smell musty. I checked the filter and found it caked with dust, so I replaced it with a new filter, and the indoor ...
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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