Mold and mildew growth can create health problems for members of your household, and they can also cause damage to your home structure and systems. Mold spores release freely into the air, leading to respiratory symptoms, headaches, stale odors, and more. If mold or mildew grows inside your HVAC system, it can easily spread to the rest of your home. Over time, mold and mildew can weaken your walls and your equipment, as well.