> Last year multiple of my colonies (insulated) made it through winter
> (robustly I might add) with a 2'' long, 2/3'' high (inches) hole only the
> bottom (no upper vent). That observation shattered any misconceptions I
> once held about winter ventilation requirements. PA/Ny/NJ zone 5a/b.
Same results and same zone but near Chicago.
R-6 sides, R-26 top, only ventilation through lower entrance and open
screened bottom board.
13 of 13 colonies made through the winter on ~30lb stores each.
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