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

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Update (January 26, 2017): I made this video in early 2016. Since then I built a new greenhouse (https://youtu.be/OzTf638Xcu0), added a geothermal system to it (https://youtu.be/Qh3-iTJvVR4), and built a compost-based heating system (https://youtu.be/qFGgZfD3G7c).

This is part 2 of a two-part series on vertical geothermal "Earth Tubes", applied to heating and cooling of greenhouses. In part 1 (https://youtu.be/e8AosXQ3OaA), 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: http://amzn.to/2jvmABz
4 ft x 1 in black pipe: http://amzn.to/2kz6K6O
1" coupling: http://amzn.to/2k80mWV

AIR CIRCULATION:
25 ft x 4 in flexible drain pipe: http://amzn.to/2kzhCkU
4" drain pipe TEE: http://amzn.to/2k9Efjk
4 in, 100 cfm duct fan: http://amzn.to/2k9CwKS
Foil tape: http://amzn.to/2jvlLZz
Cold Weather thermocube: http://amzn.to/2kzigiu

MONITORING:
Outdoor electronic thermometer: http://amzn.to/2kzrC1H
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