Some time ago I read that the earth temperature 80 cm deep is a steady 8 degrees centigrade. First thought: can we use this to cool air in the Summer? Trying to find more info I realized that there’s a LOT of challenges.

• What pipe length/diameter
• How to keep the air moving and how fast?
• What pipe material? (Aluminium is not strong and corrodes? Plastic? Metal?)
• How to handle condensation water? (Mold)

More info:

• https://www.monolithic.org/blogs/presidents-sphere/underground-air-piping
• https://dynamicdns.pairdomains.com/
• https://www.daviddarling.info/encyclopedia/E/AE_earth_cooling_tube.html

Cheers

DJ