Expensive furnace filters such as HEPA filters are more effective ... There are a wide variety of filter types, ranging from ...

We also calculate the annual costs of replacement filters, based on the manufacturers’ recommendation for when to change them. (Keep in mind that prices may vary by retailer and that it may be ...

For more on air filters, see our air filter ratings and buying guide. As with a central AC system, a dirty filter in a gas furnace can restrict airflow, leaving the equipment struggling ...