Here's an image from New Jersey beekeeping association, demonstrating a fully insulated colony with both an upper and lower entrance.
http://www.nnjbees.org/wp-content/uploads/2017/10/beesinsulate.jpg
I just want to see what BEE-L's thoughts on this set up would be? Is it to be understood that in such a set up, there's no benefit, and actually a harm for adding an upper entrance?
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