They're putting the finishing touches on a new $350,000 home in southern Indiana.
They say their home is so super-efficient, their energy bills should run just 650 bucks.
And that's for the entire year.
One of their secrets is foam insulation on the walls that is more than 10 inches thick.
The sun provides much of the heating and lighting.
If the sun's not shinning, the couple says they can heat their home with the equivalent of a hair dryer.
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