You must have had it set to Moscow, OH, because Moscow RS (UUEE), at 56°N, had 8805 HDD (ref 65°F) last year. That reconciles nicely with the 20" of wall thickness.
56°N... that's awfully close to the arctic circle. It has to be tough to be passive when the sun is 10° above the horizon at noon on the solstice.
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