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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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