You can succeed in containing dust, but no matter how much you clean, you can never get rid of it. That said, if you notice an increase in the amount of dust in your home despite your best efforts to eradicate it, don’t worry—you’re probably not going crazy. It could be, instead, that your furnace isn't doing its job to remove airborne particles from the warmed air. First things first: Check the furnace filter and, if necessary, clean or replace it. Kenyon recommends making it a habit to replace the filter every few months. If you don’t have a furnace service contract and it’s been years since you changed the filter—or if it's never been changed—“permanent damage may have been done to internal furnace components," Kenyon says.