I forgot to post a link to Ian Craig's description of his beekeeping system using two brood boxes and dummies.
I just winter in one brood box (OK, OK, my bees winter in them ... ) for most colonies and go double during the summer for the strong ones. Bees in polystyrene hives build better and more often need the second brood chamber so I'm planning to prepare enough brood boxes to give two to most hives in this coming season.
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