Attic Heat Recycling
"Heat energy builds up inside your attic -- even on winter days with chilly temperatures. The SolarAttic Space Heater takes this free renewable solar heat from the peak of your attic and supplies it to the interior of your home."
http://www.solarattic.com/space.htm
For more power, add an air source heat pump
http://www.freepatentsonline.com/4254822.html
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