I also need to get my shop insulated and a heater in it. Mine is in the attic of my garage. The floor area is 24X24, but with the pitch of the roof gives about half of that, I can use the short walls to house workbenches though. I have a window on one tall wall, and a "Door" on the other. My tillering tree was the most difficult place to figure out. Now if I can only convince my wife to let me get a small wood burning stove i'll be set.