How much will double-pane windows save in heating and cooling costs over one year, five years, 10 years? What about upgrading that vintage freezer to an ENERGY STAR model? Those are the types of questions that the Home Energy Saver calculator can answer.

Using methods developed at Lawrence Berkeley National Laboratory, the Home Energy Saver's Energy Advisor calculates energy use and savings opportunities, based on a detailed description of the home provided by you or your clients. Users can begin the process by simply entering their ZIPcode, and in turn receive instant initial estimates. By providing more information about the home the user will receive increasingly customized results along with energy-saving upgrade recommendations. See