According to the United States Department of Energy, adding winter insulation to an under-insulated older home, or even a new home, can make the house more comfortable and reduce energy bills so dramatically that the insulation pays for itself in a few years. Floors above unheated garages, foundations, ducts and basements are all good candidates for insulation. But in preparing for the winter, attics, cathedral ceilings and exterior walls should take priority.
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