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A Zero Energy Home (ZEH; often referred to as a net zero energy home) is a building that either uses no energy or one that generates as much energy as it uses. So, how does a home become a Zero Energy Home? All ZEH projects include these basic elements: vigorous energy conservation, renewable energy generation and a renewable energy-based heating system. However, the path to zero energy is unique to each home and family. Starting with why and how the owner wants to pursue zero energy, the path is also determined by house size and condition, renewable energy resource and the future needs of the family. Efficiency Vermont is investigating how to guide homeowners to retrofit their homes into ultra-low energy homes.