Sargent's house is designed to produce as much energy as it uses. The U.S. Department of Energy estimates that the average family spends $1,400 a year to run its house, with about half going for heating and cooling. The agency provides technical help to builders like Sargent to encourage energy-efficient and ``green'' home construction, or 'zero energy' houses.
LiveScience.com - Home Designed to Produce Energy It Uses
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