According to the U.S. Department of Energy, a net-zero home is one that uses 60 to 70 percent less energy than a conventional home, with the balance of energy needs supplied by renewable technologies.
Thus, if you use solar panels, your hope is to generate enough electicty to be able to sell off some and when placed against what you have spent on electricity you will be able to net out to zero.
Double-pane windows, wall and roof insulation and other green efficienies all help to reduce the amount you have to spend on powering your home.
Read this article that talks about net-zero living and the builders who are constructing net-zero homes.
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