My wife kicked me out of the garage so we purchased another home with a larger lot and I built my 2-story 800 square foot shop. The first floor has most of my non portable tools and wood storage. My Second floor has my library, duct collection, scroll saw and my mortise machine. I also store the items I will be selling at Christmas time.
The shop is heated in the winter with a pellet stove and in the summer cooled down with a 12000 btu ac unit.