Another thing to close up is the convenience center where the hose connects. With the bottom hole open the cold air can get in and no heat in that area. I don't camp in the cold, but have read about this and it makes sense. So maybe stuff something in the opening.
See what others say about maybe a light bulb in there to help heat it. Stay warm!
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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