Replacing your furnace filter is one of the simplest and most important  things you can do to keep your home comfortable and your HVAC system running smoothly. But most homeowners either forget to do it—or don’t realize how much it truly affects their furnace, air quality, and monthly energy bills. So… how often should  you be replacing your filter? Let’s break it down clearly, along with the benefits of changing it regularly  and the problems that happen when you don’t. ❄️ H