Work much better through forested areas as the sun can heat up the ground effectively. Also keep in mind that condensation inside the tube can be a problem leading to toxic mold.

Do you happen to have a link to the article? I'd like to learn more about this.

SolarJohn

Solar John, I believe I saw it in the yahoo group called PhxPermaculture. I don't know if I can include the link, but I will try. If not perhaps you can find them.

They are active in the Phoenix area, which probably explains why the person didn't have any mold problems!

Jan

Petri dishes waiting to happen.

Virtually everyone I have ever seen has been abandoned and sealed up. Condensation occurs, microbial growth begins.

Only exception might be if you live in the arid southwest.

hi there, i'm new to earth cooling tubes. here's my question, if we use a depth deeper than 3m, will the earth tube cooling will still be able to make a differences in the air temperature? in my opinion, we can save cost if we do it vertically instead of horizontally for the pipes...

yeah, you could not do that around here, most of the year the water table is no much more than 3-4 foot below grade!