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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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