The Propane Education & Research Council launches an Energy Calculator app. After starting the app, users answer a series of questions. The app then generates the heating system’s projected annual energy costs and CO2 emissions for one year. It compares the results to those of an Energy Star-qualified propane heating system. Users can save the results and email them to customers or contractors. The app “propane energy calculator” is now available as a free download for Apple and Android mobile devices. PERC