Getting some pretty good suggestions and ideas. Thanks everyone.

Looking for suggestions on how to insulate my Masterbuilt XL propane smoker. I got a needle valve regulator on it and want to smoke when we process near St. Louis and the cold really affects the time. I have a smoke tube so I can give up the smoke part, and I can give up the racks since I’ll hang almost everything. Wanting to insulate it, and can give up the window, since I don’t open it anyway until temp is reached.