I'm up in Northern Wisconsin, and have some experience with this.
My shop is heated to 65 degrees, has the ceiling insulated to R80 with the soffit vents plugged. That roof never has ice dams, even with three feet of snow on it.
My house has R96 (!) insulation in the ceiling, and is heated to 72 degrees. Again, never any ice dams.
The gas bill for the house, domestic hot water, and shop has only once exceeded $100.00 in the last seven years.
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