Do you know that the best time to do a thorough air duct cleaning and repair is during the winter season? When it's cold outside, your home, your family, and especially your allergy sufferers need all the help they can get. If your air ducts are clogged, then you may not be able to breathe properly or may even experience sinus problems. There are even people who have been diagnosed with lung cancer, emphysema, and other lung conditions because of pollutants in their home's air ducts.