I use a sleeping bag for my quilt so the bottom of the bag (footbox) is sewn up. Maybe if I used an open quilt so it was more drafty I would get different results.
The point I was making is no one solution is universal, contrary to some suggestions to the contrary. I make no claims that others should do as I do and they will be happy. Just the way it works for me. If other options fail.. try it out. Maybe it will work, maybe not.