40 by 60 16 sidewalls 2inchs close cell foam on sidewalls 3inch at rafters and above new in 2018. Heated with 80,000 furnace cooled with 3.5 ton central a.c. keep it at 65 in winter and 75 in summer only time doors are open Is to move stuff in or out. It raised my electric bill 40 dollars a month in the summer and use less than 800gal l.p. in the winter. Were located central Illinois. Was in the shop all day if I didn't have a.c. would have seating in the house not working in the shop