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This NebGuide discusses caulking the home to reduce air infiltration and increase energy efficiency. Where to caulk, types of caulking materials, and techniques for caulking are presented. Is your home an energy waster? Even in a well-insulated home, energy can be wasted through air infiltration. One-third to one- half of a typical fuel bill is the result of air infiltration. Air leaks around doors and windows, foundations, chimneys, exterior plumbing, or other parts of the structure. In the winter, air heated by your furnace is lost to the outside; in summer, hot outdoor air puts an extra load on your air conditioner. Weatherizing your home by caulking and weatherstripping can effectively reduce energy waste. In fact, the cost of caulking and weatherstripping can usually be paid back in energy savings in only one or two years. This makes weatherizing one of your best investments in energy conservation. Weatherizing to limit air infiltration also reduces drafts as well as noise and dust, making your home more comfortable. Even better, it is something that you, the homeowner, can easily do!