I have a friend in Pa. that built a pole building the same size you are anticipating. He also with 16 foot walls and a dropped/suspended ceiling. He did 6 inches of insulation and had the ceiling thickly insulated with fibergalss bats...maybe 12 inches. In the summer, in the heat and humidity of Pa. , you got a chill when you walked into the place. In the winter the single house sized furnace kept the place toasty. It was a cavernious place and he did it right. No air leaks and a spendy thermo rollup door. He had the pole and roof done by a pole bld builder and he contracted for the concrete. The rest he did himself. He was a frugal sort and I think he did the entire project for 15 or 18 grand in 89.
Good luck on your project, don't scrimp on the insulation and you don't need any windows.
Oh no, not going cheep on insulation, The 6" was the only Option they gave Id rather have 12"
Heat will be a Pellet stove. I have one now and its awesome. They put out heat at about 86% efficiency I love it, and it heats our 1600 sq ft well.. Plan on a Tankless water heating system as well. I have that here too. Very economicle. Saves Tons of propane..
How come I dont need any Windows
You dont want me lookin Out