What kind of oil filled radiator do you use? I got thinking about the floor plan in my shop. My shop is 36'x48' but I have one 12'x36' bay walled off from the rest of the main shop. The larger main part has three overhead doors, and the smaller walled off section just has one exterior entry door and another entry door to walk into the main shop area. I think this smaller area would be perfect for my machines. I wouldn't have to worry if I had one of the overhead doors open in the larger main area, and heating the smaller section would be way easier. Matter of fact, in the smaller section I have a small 220 volt heater on the wall already. Both sections are well insulated and sheetrocked.