When you agree to join the Builders Challenge, you commit to constructing
        homes that rate 70 or better on the EnergySmart Home Scale (E-Scale)
        and that deliver comfort, quality, durability, and a healthy indoor
        environment consistent with Department of Energy's Building America
        performance criteria. The DOE challenges America's home-builders
        to build 220,000 high performance homes into the marketplace by 2012.