I have one of those garage approved natural gas furnaces hanging in the corner of my shop. Back when I worked every day, the programmable thermostat was set at 60 over night and bumped up to 64 during the day when I was working. I kept the over night so high because I had a lot of steel in racks in the shop, and if that got too cold, there wasn't a furnace made that could warm the place up.
Now that I'm retired, and the amount of steel sitting here has diminished a lot, the over night temp is 55, and i bump it up if I'm working in the shop. 64 is a good temp to work in, but a bit too cool if a guy was sitting around not doing anything. Gene