Here at McQuerry’s, we hear this question often. Regularly changing your AC system’s filter will improve the effectiveness and longevity of your AC unit! The life-span of your filter will depend on the type of filter you use and the quality of the indoor air of your home. Generally, we recommend changing your filters at least once per month, just to be safe. It’s always a good idea to keep an eye on your filters. When you notice that they’re dirty, change them! If you have any questions about replacing your AC filters, don’t hesitate to contact McQuerry’s at 636-225-0087!