Furnace Air Filter Maintenance

The purpose of the air filter is to filter out dirt, dust, and other contaminants from getting into your home’s air. The filter is in the return air duct of the furnace, where the fan sucks in air.

Your furnace’s air filter should be changed at least every 3 months. Ideally, you’ll want to change it every 1-2 months. Pleated filters usually last a bit longer, but introduce a larger pressure drop in the system – be sure that your furnace is designed for that...

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