Llyod said:

"If your conditions are more
like Chicago, Boston, Kansas City, Detroit, or Albany, NY, don't worry about
the cold, and be generous about upper ventilation."

And then Blane added:

"So provide an upper entrance like Lloyd and
most beekeepers advise but I suggest it should be between the boxes
instead of at the top of the hive."

What would be the best way to provide this ventilation between brood boxes?  A drilled hole? Some other way?

Curious as I head into my first winter with bees,

Mark H