Quote Originally Posted by nova_robotics View Post
I used to work in -50C in the oil patch. I get it. But how would the heat get through the plywood to warm you up?
Maybe it is not as much about actually keeping them warm as it is about taking some of the bite out of the air around them. Similar to how smudge pots are used on the windward side of citrus orchards will take just enough of the bite out of the air to protect the crops.
I suspect the constant movement of these guys are doing more to warm the air around them than what little radiative heat is being transferred through the plywood Although a slab of plywood that is 100C on one side is going to be at least half that on the other.