Earth heat is really good to capitalize on. Digging a rectangular hole 8' deep is Ok but requires structural reinforcement to keep it from collapsing in is Dangerous. Your idea would work better if the insulation was placed uust under the surface of the ground below the green house floor, and to 10 feet to the outside of the green house. Putting the pipes in direct contact with the ground, Deep in trenches made with a narrow back hoe, then covering them with the material removed, conducts much more heat into the soil, and back out of it. This is not a flame, I teach this material in my alternate energy classes and Leed certification instruction. You never indicated weather the resulting hole was filled back up. Jim
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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