My 30 X 48 shop has 21' to the peak - 14' sidewalls... I live in "Seattle" so it's a moderate climate.
6" walls and joists -- with 6" bat insulation.
I heat the entire space using only the T12 HO fluorescent lighting... but it's ON 24/7 in the winter. The upstairs area is TOO WARM... it's 70* on the lower floor. My electric bill is less than $300 a month.
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