Kevin I understand there are circumstances that come up and a shop is far from the list of necessities but if it is your business then you have to make it a priority. This is what pays the bills. The expense can be written off on your taxes. Health issues is different. But I read not only here but other forums about it is too hot or too cold. There maybe just a handful of perfect days to be out in a shop. Many years ago when I got started in this and woodworking in general, I left a scrollsaw out in my shed and on those beautiful days I would scroll under a nice large oak tree in my back yard. It was nice and the lighting was great and all but then I moved operations to my basement and have not looked back. Even in an uninsulated shop you will be surprised you can change the temp with little trouble. I have at times did some finishing and also powdercoating in my garage with a couple electric heaters running. Yes the garage is sheet rocked but no insulation in the walls and the door leaks and it very cold but it does not take much. If you make it work for you than all is well. But as I said I read these types posts all the time and scratch my head, why build a shop if you can not work in it.