Furnace Filters – How Often Should They Be Replaced in St Charles, MO Homes?

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!

< Older Post Newer Post >
Technician inspecting an outdoor HVAC unit with gauges and hoses beside a brick wall

Why Chesterfield Homeowners Schedule AC Service in July (Not August, When It's Too Late)

By AAA Home Services • July 30, 2026
Full AC service in Chesterfield, MO — tune-ups, repairs, and replacements from AAA Home Services. Call (636) 397-3200 for upfront pricing and same-day service.
Water dripping from a faucet into a dark sink, with a bright window in the background

Old Pipes, New Subdivisions: Why Saint Charles Plumbing Isn't One-Size-Fits-All

By AAA Home Services • July 28, 2026
Looking for a plumber in Saint Charles, MO? AAA Home Services offers licensed, upfront-priced plumbing since 1965. Call (636) 397-3200 for fast local service.
Two outdoor HVAC units beside a house wall, one round and one rectangular, both gray.

Heat Index Over 100°? Why O'Fallon ACs Break Down in Late July

By AAA Home Services • July 26, 2026
AC repair in O'Fallon, MO from AAA Home Services. Fast same-day service when your air conditioner fails. Call (636) 397-3200 — we're right here in O'Fallon.
Water dripping from a faucet into a dark sink, with a bright window in the background

O'Fallon Is Growing Fast — Here's How to Find a Plumber Who Keeps Up

By AAA Home Services • July 24, 2026
Need a plumber in O'Fallon, MO? AAA Home Services offers licensed plumbing, emergency service, and upfront pricing. Call (636) 397-3200 for fast local service.
Show More