How Often Should Furnace Filters Be Replaced in St. Charles, MO?

Jessica Primeau • January 20, 2023

As a homeowner, it’s important to keep up with furnace maintenance. One way to do this is by replacing furnace filters regularly. But how often should this be done? Read on for a quick guide to to furnace filter maintenance:

How often should furnace filters be replaced?

It’s generally recommended that furnace filters be replaced or cleaned every month. To make sure you don’t forget, set an alert on your calendar as a reminder.

Close-up of gray, fuzzy fibers trapped in white diagonal strips

Why is replacing furnace filters so important?

Because it promotes good air flow and prevents stress on blowers. A clogged filter will restrict air flow, causing your system to work harder and less efficiently. This use can lead to a shorter lifespan for your system overall. Not sure what type of filter you need? Our team at AAA Heating & Cooling can help you select the best option for your home and family. Just give us a call!

What about media filters?

Media filters should be replaced once a year, possibly twice depending on your home. Homes with pets or smokers may need to replace media filters more frequently. Consider adding an alert to your calendar for six months after you install a new media filter. That way you can be sure to stay on top of regular filter changes and keep your family breathing easy all year long.

Contact Us for Help with Your Furnace Filters

It’s important to regularly replace or clean your furnace filters. We recommend monthly replacement for 1″ filters and annual (possibly bi-annual) replacement of media filters. By staying on top of this simple maintenance task, you can ensure good air flow and prevent stress on your system – leading to a longer lifespan for your furnace overall.

If you have questions about which type of filter is right for your home, give AAA Heating & Cooling in St Louis or St Charles a call – we’d be happy to help!

AAA Home Services electrician installing a ceiling fixture in a home
By AAA Home Services Team • September 26, 2026
From GFCI outlets to ceiling fans, small electrical jobs in O'Fallon homes add up to real safety. Here's what's worth calling a licensed electrician for.
By AAA Home Services Team • September 24, 2026
Sump pump failing signs, testing steps, and lifespan facts for St. Charles County homeowners. Fall is the time to check, before spring flooding season.
AAA technician discussing an appliance repair with a homeowner in a kitchen
By AAA Home Services Team • September 21, 2026
A loud refrigerator at night usually has a fixable cause. Lake St. Louis homeowners, here's what's making the noise and when to call for appliance repair.
AAA Home Services electrician installing a ceiling fixture in a home
By AAA Home Services Team • September 19, 2026
Not sure what happens when an electrician shows up? O'Fallon MO homeowners, here's an honest look at the process from diagnostic to final invoice.
Show More