Maintaining a furnace is an important part of taking care of your home. These tips and web extras provide information on the types of filters available and the best ways to keep a furnace in check.
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Maintaining a Furnace
Filter Information (Web Extra)
Spun Fiberglass Filters are the least expensive, disposable filters. They don't, however, adequately filter out finer particles.
Pleated Disposable Filters are more costly but will provide four to eight times the filtering capability of the spun fiberglass filters.
Washable Electrostatic Filters have a high initial cost but they are re-useable and offer much higher filtration rates.
There are Electric Filters and Mass Media Filters that offer superior filtration but they require modification to the ductwork for installation. But note that installing these types of filters is not a do-it-yourself project; they should be professionally installed.