Here in SW MO it went from 65* first of the month to 85* for a week then 90*+ now! I got out the window A/C a few days ago and shoved it in the only window in the shop. It's only a 5,000btu but that's the only one that would fit in the window, but where I have my scroll saw I can direct the cold air right on me
My shop is a 18 x 30 metal building I had put up 3 yrs ago. The cement floor helps in the summer...not so much in the winter. The first winter after it was finished I stumbled on a great deal on insulation! A guy from KS was doing a large spray foam job in my area and had enough leftover chemicals to do my shop. Rather than just throw away the chemicals he just charged me the labor and turned my shop into an Igloo cooler! Like Kevin, I have trees that shade it from noonish on so the baby A/C will keep it tolerable most days.