Tropicallvr
02-18-2010, 03:30 PM
Found this googleing geothermal greenhouses. It's a zone 6 (Missouri)green house that grows figs without heat source, but it's not really geothermal. The owner says it never got below 48F last winter.
Missouri Vegetable Growers Association Newsletter - AgEBB (http://agebb.missouri.edu/hort/mvga/archives/May08/mvga3.htm)
The basic idea is to have a network of large pipe 3ft down, covered in white rock(better for heat tranference), then covered by soil, but the ends of the pipe are vented into the greenhouse with quirrel fans inside the pipe which are set to a thermistat. He also insulated inside the trench around his greenhouse with 4" foam isulation.
A real geothermal greenhouse growing tomatoes in Utah without heating costs-
ksl.com - Iron County family grows tomatoes in the dead of winter (http://www.ksl.com/index.php?sid=5309531)
And a interesting travel perspective of Icelands geothermal baths, and tropical greenhouses, ect-
Strange Sensations in Iceland (http://www.perceptivetravel.com/issues/0109/iceland.html)
Missouri Vegetable Growers Association Newsletter - AgEBB (http://agebb.missouri.edu/hort/mvga/archives/May08/mvga3.htm)
The basic idea is to have a network of large pipe 3ft down, covered in white rock(better for heat tranference), then covered by soil, but the ends of the pipe are vented into the greenhouse with quirrel fans inside the pipe which are set to a thermistat. He also insulated inside the trench around his greenhouse with 4" foam isulation.
A real geothermal greenhouse growing tomatoes in Utah without heating costs-
ksl.com - Iron County family grows tomatoes in the dead of winter (http://www.ksl.com/index.php?sid=5309531)
And a interesting travel perspective of Icelands geothermal baths, and tropical greenhouses, ect-
Strange Sensations in Iceland (http://www.perceptivetravel.com/issues/0109/iceland.html)