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

Earth tubes (earthtubes, or earth-air tubes) are underground tubes that use geothermal energy to cool or heat temper the air for your home. It works like cheap air conditioning because you can build it yourself for several hundred dollars and it is FREE to run (no electricity needed). Being completely passive, this is a sustainable technology based on designs that are 3,000 years old and still used today around the world to cool homes.TABLE OF CONTENTS (chapters, sections, page numbers):;Introduction 15; Who Invented Air Conditioning? 15; How Earth Tubes Work Like an Air Conditioner 18; The Cost of Earth Tubes vs Air Conditioning 19;Background and History of Earth Tubes 23; How I Learned About Earth Tubes 23; Qanats - 3,000 Year Old "Earth Tubes" 24;Effective Use of Earthtubes 34; How Earthtubes Work 34; Convection Brings Cooler Air Inside the House 36; Evaporation and Condensation 38; Best Material for Earthtubes 41; Interior Thermal Mass Enhances Earthtubes 43;How Many Earthtubes Do