Think I've got that problem pretty well taken care of now. The winters here in central NC aren't bad - not compared to MI winters, that's for sure. My shop is wood, small, 8X12, and not insulated.
I started out by closing both doors. This help, but still got chilly. Then the older son gave me one of those oil filled heaters that look like a radiator. The thing works well enough it would seem, but also seems to take forever to get warm, and even longer to hat the shop. I think it would be great for maintain the heat, but for the initial heating, it sucked.
Then I got one of those little ceramic electric heaters, with a fan. Doors still closed. Noisy, but puts out heat almost instantly, and seems to work pretty well. I got the impression it sucked up a lot of electric tho.
About this time I beliee it was, I got the idea for a plastic strip door. Probably most of you have seen, or at least seen pictures of, long clear plastic strips allowing people and machines to pass thru, but keeping heat or cold from entering or leaving, as the case may be. So cut some pastic window dovering and hung that. This actually works quite well. If I redo it I will use couble strips, and wider, next time. This lets some light in and keeps away the feeling of being in a large box.
Awhile back got one of the Mr Buddy propane heaters, the small one. Finally tried it out. Worked nicely. Heat whthin about a minute, and heat in the sh op going up noticably withing 5-10 minutes. The hard part then was dedicing where to put it. Finally decided to hang it from the ceiling, near t he back. Ah, works. With a however. No matter what anyone tells you, thee is almost always a h owever. This however was, it was too high. So made a wooden extension to hang from the wooden hooks I had put up before, so it will hang about 22 inches lower. That'll put it low enough it'll direct heat at me even when I'm sitting. And, if it turns out it's a tad too low, it'll be plenty easy enough to raise it however much is wanted. Behind the heater is the window, that's cracked open, with a fan blowing air in. The fan is mostly blocked, so just a small amount of fresh air is coming in, not much to heat, and it keeps any fumes, and fine dust in the air floating toward the front, and the plastic strips. This should make those winter days much more tolerable, even pleasant. Summer is no prob as the shop is shaded most of the day and the fan keeps air going thru - don' need no steenkin' air conditionin'.
Oh yeah, I glue up in the house. Even when it's warm enough to safely do it in the sh op, I generally just do it in the house. Live is basically good.
JOAT If you can read this you're in range.