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DIY: How to Make Cheap Air Conditioning Earth Tubes: Do It Yourself Homemade Air Conditioner - Non-Electric Sustainable Design - Geothermal Energy - Passive Heating and Cooling Paperback – January 4, 2016
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But history is only the tip of this iceberg, the book is chocked full day useful information, sketches, scientific background, and how to guides. By following the diagrams and information given by the author I could install earth tubes in a house. This book is worth a read for all energy conscious individuals.