Greenhouse 2.0 Geothermal AND Compost Heating (Part 1: Design)

Geothermal heating results: https://youtu.be/VtPfUy6T2Jc
Compost heating results: https://youtu.be/Dm7fQQrKlSs
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With the benefit of several design iterations and much constructive feedback from my viewers, I'm unveiling PASSIVE-HEATED GREENHOUSE 2.0! The new design incorporates BOTH Geothermal GAHT (Ground-Air Heat Transfer) and Compost heating. The GAHT system is now closed (no exposed dirt), with the pipe laid in a U-shaped configuration, the first I have seen on YouTube.

Subsequent videos will show performance data
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