We cannot emphasize enough how critical it is to replace the air filter regularly. During peak heating season, the general rule is to return it once a month. The same rule should apply all year if you have smokers or pets, as the filter will clog faster. Also, if you need help determining what MERV-rating your filter requires, consult the owner’s manual to see what’s recommended.
Many homeowners may wonder why it is so important to replace the filter regularly. The filter’s job is to trap airborne contaminants and keep them from circulating through the air within your furnace and home. As it does so, the filter becomes clogged with dirt, dust, pet hair, and other debris.