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© 2026 Heartland Homes. The information provided herein is based upon assumptions and information provided by reputable sources, including the National Weather Service (average heating and cooling usage in relevant reference cities), the US Energy Information Service (annual electric utility data) and the Department of Energy (relative energy efficiencies of prevailing building codes) as well as private entities such as RESNET (HERS rating methodology) which are not affiliated with NVR. The estimated energy costs and savings take into account typical usage and costs at a given point in time for a specific model of home in a specific location. Actual savings will vary and will depend on many variable factors and a change in any of these variables or assumptions could result in reduced cost savings or higher energy costs. Such variables include, but are not limited to, homeowner behavior, actual utility usage and consumption, the fluctuating cost of energy, actual weather conditions, and home and equipment maintenance over time. Heartland Homes does not guarantee or warrant actual energy costs or cost savings.