N4ext year, spend some time and money adding more insulation to the shop walls, ceiling, and FLOOR. People tend to forget that the floor needs to be insulated. Of course, if the floor is a concrete slab, its too late to do anything, other than put in a wooden flooring on top of it, and perhaps hot water heating coils under the wood flooring. That might required you to raise the ceiling if you are tall like me. Even putting cheap Styrofoam insulation between the flooring frames will give you more insulation against the cold ground than doing nothing.
Cold floors sap a lot of heat out of garages and small shops. When I was 15, I had a job working part-time in a wood shop belonging to a neighbor, who converted part of his garage to that purpose. No insulation in the wall, nor ceiling, and concrete for the floor.
He was so cheap, he turned the heat off at night, making it below freezing in the place when we arrived in the morning. That electric space heater ran all day long, and at the end of the day, it might be 45 degrees in that garage. Its hard to get much work done when you hands are so cold. Of course, he didn't want to pay to heat the building day and night, which I can understand. But, it was ridiculous for us to try to work in that garage when our breath was forming clouds of steam( below zero air temperatures) that reduced visibility in the place. We worried about water condensing on the few light bulbs, fearing we might short them out.
Learn from the mistakes of others. Its easier on the toes and fingers. :grin: :v :haha: :hatsoff: