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5 Quick 1-Hour Improvements
By: , This Old House magazine
Change Your Furnace Filter
You can't see this, but you'll feel it: If you have forced-air heating, change the furnace filter—before you start the heating season. You'll notice a difference in the air quality, and your furnace will run more efficiently.
Time: 10 minutes
Richard Trethewey, Plumbing and Heating Expert
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