Heated floors are great, but my hangar doesn't have one either. I have heat in my insulated hangar and the next best thing to a heated floor: They were replacing the carpeting in our terminal and I snagged two 12'X25' sections of the old carpet and put it in my hangar. The carpet adds an insulation layer that keeps your feet warm in the winter and if I drop a nut or a screw while working on my plane, it generally stays where it falls and doesn't roll to the far corner of the hangar where I'll never see it again.