Earthtubes are sustainable, non-electric, passive geothermal heating and cooling systems.
Earthtubing utilizes conventional, thin wall, plastic pipe to pre-heat your home's air intake. Fresh air enters a system of these pipes which are laid around the exterior and interior of your home's foundation. You can let the air draft naturally through your earthtubes for a truly sustainble, non-electric, passive geothermal system or add fans and filters to supplement the home's back-up heating and cooling system.
Website: http://www.thenaturalhome.com/earthtube.htm
A personal quest to promote the use of wind energy and hydrogen technology in the Great Lakes area of the United States. The Great Lakes area is in a unique position to become an energy exporting region through these and other renewable energy technologies. *Update 2014: Just do it everywhere - Dan*
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