itma
Queen Bee
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I'll look at making some ekes. We bought some National to 14/12 converters which I'm sure would have done the job if I'd made them up already!
That conversion wants a heavy-duty eke. Normally folk use something much more lightweight (and cheaper!) for this sort of task.
Food (sugar, honey...) is the source of heat.
Its a bit controversial, but reducing the heat loss logically ought to give a reduced consumption of stores. If there's enough food, and enough bees to process it, then they can make enough heat to survive in pretty appalling conditions.
One concern for the next few months is to avoid OVERfeeding. You want to come out of winter with a fair bit of empty comb in the hive - ready for the spring population explosion. Lack of (empty) space promotes early swarming.
Scylla and Charybdis...