Vertical Geothermal Earth Tube (Part 2) - Greenhouse Heating/Cooling

2019/20 greenhouse    • Greenhouse 3.0 - naturally heated by ...  
2018/19 greenhouse:    • Greenhouse 2.0 - Geothermal AND Compo...  
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Update (January 26, 2017): I made this video in early 2016. Since then I built a new greenhouse (   • $100 Greenhouse! Wood construction wi...  ), added a geothermal system to it (   • Vertical Geothermal Earth Tube in New...  ), and built a compost-based heating system (   • Heat Greenhouse with HOT COMPOST.  20...  ).

This is part 2 of a two-part series on vertical geothermal "Earth Tubes", applied to heating and cooling of greenhouses. In part 1 (   • Vertical Geothermal Earth Tube (Part ...  ), I describe the background behind the project and its performance. In this video, I quickly summarize how the system was built.

Parts List:

DIGGING:
Seymour post-hole auger
4 ft x 1 in black pipe
1" coupling

AIR CIRCULATION:
25 ft x 4 in flexible drain pipe
4" drain pipe TEE
4 in, 100 cfm duct fan
Foil tape
Cold Weather thermocube

MONITORING:
Outdoor electronic thermometer