Tim, I take it that the mail in which you mentioned ........."The article I read discussed problems they were having with losses concentrated in certain portions of the building due to uneven ventilation." was referring to a topic I posted several weeks back. The Bee-L archives will show interested parties several responses. I managed to get further info. as printed in "Beekeeping in Western Canada" edited by J. Gruszka (Saskatchewan Provincial apiarist, Canada) ISBN: 0-7732-6139-7 Published by Alberta Agriculture, Food and Rural Development Publishing Branch 7000 - 113 Street Edmonton, Alberta T6H 5T6 It contains a good section in chapter 10, referring to Indoor wintering. >From other sources, I understand that this section was the result of work undertaken at Winnipeg Univ. (correct if incorrect!). The information relates to the indoor wintering of full blown colonies, giving indications on temperature, humidity and air quality control etc. How the figures and mechanisms mentioned would translate when trying to winter nuc. colonies - I had no knowledge. I suggest that it would be useful info. for Robin to get hold of. Regards, Peter :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::