Electrostatic Filter

An electrostatic filter is the most effective filter for forced-air systems, states Reader's Digest. A professional filter installer attaches it to your ductwork. The filter cleans air produced from air conditioners and furnaces and rids it of allergens, such as dust and mold spores. It also prevents household dust in the home by keeping it from getting into your ductwork. These reusable filters cost between $700 and $1,500 per filter and usually have a lifetime guarantee.

Fiberglass Filter

A standard fiberglass filter is a less expensive alternative to the electrostatic filter. It works to effective eliminate dust buildup in your forced-air cooling and heating system and ensure system efficiency. Although it helps keep your air conditioning and furnace functioning optimally, it has little impact in combatting household dust. Fiberglass filters are disposable and must be changed every 30 to 90 days, contingent upon how often you use your air conditioner or furnace. Expect to pay $40 to $100 per filter based on the brand you choose.

Pleated Filters

Reader's Digest states that pleated filters composed of paper and fabric are a good disposable filter option. Unlike fiberglass filters, pleated filters clean air in the forced-air cooling and heating systems and help remove household dust. Replace them every three months or less if you have household pets, as pet hair can lead to an increase in dust and dander. Reader's Digest recommends inspecting your filter every month for dirt, and swap out when it appears filthy. Clean filters ensure your air conditioner and furnace work efficiently. Depending on the efficiency and thickness of the filter you choose, pleated filters cost about $4 to $15 each.