Choosing not to clean your ductwork can cause problems for you and your home, including health problems, dirty rooms and surfaces, and high energy bills. When dust and pollutants build up in your ductwork, it filters into the interior of your home and builds up on surfaces. You breathe in that filth and are forced to clean far too often. As residue builds up inside your HVAC system, it decreases its efficiency and makes it harder to maintain a comfortable indoor temperature. Your heating and cooling bills are higher because you’re using more energy than you should.