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A net-zero energy house produces as much renewable energy as the house and its occupants use. It is a concept that was almost unthinkable just a few years ago.
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Building a Net-Zero Energy House in Boulder, Colo.
A net-zero energy house produces as much renewable energy as the house and its occupants use. It is a concept that was almost unthinkable just a few years ago.
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Building a Net-Zero Energy House in Boulder, Colo.
A net-zero energy house produces as much renewable energy as the house and its occupants use. It is a concept that was almost unthinkable just a few years ago.