The “Electro HVAC Calculator” app is designed to assist users in making informed choices about their energy efficiency and heating options. The app allows users to input details about their building down to the R-values of the windows and receive annual savings estimates, as well as filter and select products that meet their needs. Pre-programmed follow-up options are also available for added convenience. In addition, the app includes a feature that allows users to compare electricity as a heating source to their current source, enabling them to determine if switching to electric heating is a viable option.