Here is interesting Israelian research .http://www.beekeeping.com/articles/us/solar_heating.htm
It tells, that in USA climate insulated hives have big advantage. Heating is really comlex, but it tells that makes good for winter brooding.
I you use insulated boxes, your nucs will develope much more guickly and you can get honey first year.
This forum does not let me in any more
, but greetings to you.
DONT INVENT PROBLEMS FROM NOTHING!