How Long Should a Furnace Air Filter Last?

It is important to change your furnace air filter regularly to ensure that the air in your home remains clean and free of dust and other contaminants. The frequency of filter changes depends on the type of filter you have, the location of your home, and the age of your system and equipment. Generally, most air filter manufacturers and HVAC companies recommend changing the air filter every 90 days or 3 months. However, this may vary depending on the environment of your home, if you have pets, and other factors.

If you have pets at home, you should consider changing the filter every 60 days or 2 months, and in the case of households with several pets or people with allergies or respiratory conditions, we recommend that you change the filter every 20 to 45 days. Vacation homes or empty houses that aren't used much can wait to change filters every 9 to 12 months. The type of filter you have also affects how often it needs to be changed. For example, a one-inch oven filter should be changed every one to three months, while a three- to four-inch filter can last six to nine months. A five- to six-inch coarse-grained filter can last nine to twelve months.

Thicker filters may last longer than thinner filters. You can have one of our HVAC professionals come to inspect your filters, just to be sure. Always follow the manufacturer's recommendations on how often you should replace filters. As a general rule, most filters should be replaced every 3 to 6 months. Marking the calendar every 90 days or trying to remember the last time you changed your filter can be a challenge, so many oven manufacturers recommend replacing them at the start of each new season. If windows and doors are often left open, one-inch and two-inch filters will need to be replaced monthly, four-inch filters every two months, and five-inch filters every three months. The air in your home is drawn into the return ducts through the fan, so it can be heated or cooled and pumped back to your home.

The filter is placed in a shared air controller where it cleans the air before diverting it to the air conditioning unit or oven. Without a filter, the oven would stop working fairly quickly because the equipment would be too dirty to work properly. Change your furnace air filters regularly for optimal performance and cleanliness in your home. For one-inch oven filters, it is recommended that they be changed every one to three months. Three- and four-inch filters can last between six and nine months, while five-to six-inch filters can give you nine to 12 months of filtering action.

Be careful not to confuse Honeywell oven filters with your HEPA air filters for purifiers, which last much longer.

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