Visit NPPD's website to use the Home Energy Calculator. You will enter basic information about your home and the calculator uses data from local weather, typical home construction, and energy-use histories to estimate your home's energy costs. Select the characteristics that most closely resembles your home and calculate. The calculator will produce approximate monthly and annual energy costs for your home and has the option to receive the reports via email. It will help you determine which changes in your home will produce the most savings. Try the