Why is my air filter getting dirty fast?
If you notice that your air filters get dirty very quickly, it might be due to the quality of the air filter you're buying. Cheaper air filters cost less because they are low quality. As a result, they have a shorter lifespan than high-performance air filters. Take for example a standard fiberglass air filter. Why does my air filter get so dirty so fast? You're leaving your thermostat fan set to ONAnd when the air in your home circulates through your filter and AC system non-stop, it's going to pick up dirt and air contaminants at a much faster rate.