Slide 2: How to Change a Furnace Filter

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Check your filter for obvious dirt. Don’t try to skimp by cleaning and reusing cheap hardware-store filters, says Mike Bonner, at Gray Furnace Man. They have been sprayed with an oil that catches dirt, and once saturated they are no longer effective. “I recommend that homeowners replace their filters once a month,” says Bonner. “A monthly routine will be much easier to remember than every two months—and it’s that important.”


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