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Here is the calculation I found that got me on the high side: "If you have really good insulation you can simplify this number to 0.5, average insulation to 1, weak to 1.5, and 5 if you have no insulation. Take this number and multiply it by both the cubic feet and the amount of temperature...

Hello, I've got a 30x40x12 pole barn that I had closed cell spray foamed at 3-4" on the ceiling and 2-3" on the walls. I've got one insulated 10x10 door, a man door and three small double pane windows. The slab is 5" thick and uninsulated. My location is near Colorado Springs at about 7,400'...

I got one awhile back for my machinist tools. It was okay for awhile, but started to sag a bit under the weight of the tools to the point where the lid doesn't close properly. I would hold out for a better box if possible.