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If you can keep the wind out, uninsulated is fine. I guess it depends on how harsh conditions you fish and how much propane you want to burn. You can always line the ceiling with reflectix if you need to.I have an uninsulated one man Eskimo, and the lack of insulation is the least of my concerns. The biggest concern is how cramped it is. We fish two holes for perch and its crowded in the shack trying to handle two rods with a fish finder and heater running. Not having enough headroom to stand up also kills my back while packing up on a cold windy day when I don't want to just flip it open. It works, but i would love either a wide-one or an Evo for more space.