Tuesday, July 06, 2004

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

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