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Really the best place to start is with more insulation. I realize that it's not your shop and probably not what he asked you, but unless he has firewood falling from the sky……
i picked mine up for $100. while my barn is uninsulated, it is nice just to work in front of. then i have an insulated room in the barn where the wood boiler for the house lives to bring smaller projects into.
Nothing available from the regular folks for residential use will be big enough. He's better off getting a radiant heat source to stay warm "campfire style". Think propane patio heaters or overhead radiant tube heaters also gas fired.