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winter
If you are going to shrink wrap anything consider the hull from the bottom on the ports to the ground. This will prevent the windchill from robing all your heat away. If you have to choose between heat and circulation, choose circulation. Ports can be sealed with bubblewrap and tape to prevent heat loss and you may consider cork or bubble wrap beneath your sleeping pad/foam/mattress.
Your BTU question requires more info on size of boat etc.
Good Luck
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