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Look up LDS Prepper Geothermal greenhouse on YouTube. He has a working geothermal system that uses 4" plastic drain pipe that is 8 feet below the ground where temperatures tend to be around 55 degrees year round. A fan pulls air from one end of the greenhouse, down the buried pipe and back out again. The exposure to ground temperatures changes the air temperature in the greenhouse. This is a working system that heats in the winter and cools in the summer. His videos have all the necessary details.
Hey Rick, Don't forget that the earth maintains a constant temperature. Geothermal actually is an air conditioner in the summer. It's the best of both worlds.
FYI the DIY option you are looking for is called an "earth tube" and you can find some write up on "Build it solar"
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Posted:Mar 27, 2011
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