Is that "heater bar" electric or propane.
I would guess your being surrounded by the Great Lakes you see more moisture in the winter than I do here in lower New England. Although I like the "heater bar" idea, I am lucky enough to have a Gable Vent fan on a timer that runs twice a day for a half hour take care of any moisture and keep my unattached unheated garage dry and my motorcycles in good shape.