Not only do you get the benefit of not having to heat your greenhouse during the winter, but the water barrels that act as the heatsinks allow you to store hundreds of gallons of potable water too! FYI, he starts talking about his supplemental heat system at around the 5:15 mark and then a bit about the airflow setup he’s installed as well, but most of the video is a tour of the many vegetables he has planted. Enjoy. 🙂
DIY Geothermal Greenhouse – No Supplemental Heat Needed
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