I recently constructed a small lean-to greenhouse (video here: https://youtu.be/OzTf638Xcu0) against my screened-in patio. In this video I show you how how I added a Vertical Geothermal “Earth Tube” system to heat and cool the new greenhouse.
The Vertical Geothermal Earth Tube is a low-cost alternative to the conventional Earth Tube, which requires you to dig up your back yard with a backhoe! For more background on this idea, see these two videos (https://youtu.be/e8AosXQ3OaA and https://youtu.be/ghmvI9U1KQI)
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what will keep the holes from collapsing?
Wow, that's getting pretty sophisticated. I'm impressed.