Do you have a drafty window? Do you find yourself getting busy with all sorts of tricks with the windows just to keep your home warm or cool? Do you see visible cracks or gaps? Are your problems with the windows and/or doors related to the usual wear and tear or are these all signs of improper insulation? If any of the questions above are troubling you, there is a strong likelihood that these problems are costing you some 30% heat loss in your household.