The ideal indoor humidity levels in your home should be between 35% to 50%; this level is the air's comfortable moisture level. If the level is higher than 50%, the home could grow mold and bacteria, you may suffer from stuffy conditions, and you will feel overall discomfort. Alternatively, if the levels are lower than 35%, you could be at a greater rick of catching ill, experiencing dry and itchy skin, and damaging your house's wood, siding, or paint.