Across America homeowners are increasingly interested in ways to understand and manage their home energy costs. Building on this momentum, Microsoft recently unveiled its Hohm software , which allows homeowners to understand the energy use of their homes, compare to neighbors, and discover opportunities to save money on utility bills by lowering their energy usage. Unlike Google’s Power Meter which uses actual information garnered from utility smart meters and energy monitoring devices, Hohm takes information from a few simple questions – including your zip code, the size of your home, and the year it was built – to provide an overview of annual energy usage and estimated energy costs. Hohm then generates a free energy report based on your answers. The report can help identify ways to make your home more energy efficient, estimating what your potential cost savings may be by investing in efficiency improvements. The Hohm service is free, though it only connects automatically to actual electricity usage data for 4 million customers on the West Coast as of yet. Homes outside this service are receive energy reports drawing on averages rather than property-specific information. According to the Hohm database, a typical home in Berea, Kentucky can save up to $1,736 each year—achieved mostly through reduction in heating costs, likely from better insulation and efficient windows. The potential for improvements in efficiency and cost is particularly great throughout Central Appalachia. This map shows that Central Appalachia in particular, and the Southeast more generally, has some of the...