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Old March 21, 2017   #86
Cole_Robbie
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Location: Illinois, zone 6
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I would think one would still have to insulate the north wall, even if it was buried in a hillside, because the dirt would act as a cold sink and suck away heat energy. But that is just a guess, and could also be valuable to prevent over-heating. If one is paying for heat, mass can work against you, because when the mass is cold, your heat has to run more.
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