> In a northern climate perhaps the largest effect will be in spring build-up
> 5% difference in linear dimension (5.44 vrs 5.2) makes a 10%  difference in area
> So 10% more brood in the same volume, brood that must be kept warm
> As well, the brood makes some heat, I don't know if this is  significant

That is my thinking and we seemed to see some advantage for the 5.25 
cells in Pierco compared to 5.35 in other foundation in a rough test we 
did in 2000.

http://honeybeeworld.com/diary/articles/fdnvsdrawn.htm

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