Furnace Air Filters

Furnace Air Filters by mikey and wendy
Furnace Air Filters, a photo by mikey and wendy on Flickr.
Furnace Air Filters #2
I learned a few years ago that the best way to keep a efficient home furnace running was to regularly clean or replace the air filters. You can see just how much difference it makes to quickly swipe a vacuum past the filter.

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