I recommend Meghan Milbrath's article in the ABJ January 2020. There is a picture of a:
> Screened research colony used to overwinter colonies through Wisconsin winters. The temperatures in the screened hives were similar to temperatures in wooden hives, demonstrating how little heat leaves the cluster.
She goes on to say:
> It may make you feel better emotionally to insulate and add quilt boxes and vent and wrap, but if you really want to improve your bees’ survival, make sure you ... raise a strong, healthy generation of winter bees.
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