>INDOOR WINTERING OF HONEY BEE COLONIES IN MANITOBA - https://dam-oclc.bac-lac.gc.ca/eng/90fcb135-2096-4e90-867c-41a7ddcac9a2

Another interesting Master's Thesis. Not sure the relevance of comparing indoor wintering versus outdoor wintering relative to the question of whether thermally-resistant envelopes confer a net benefit on outdoor colonies in temperate climates. 

I did notice that the outdoor colonies were prepared as follows: '... two hives were placed together, wrapped with a layer of fibre-glass insulation (R10) and then with a layer of black tar-paper. The tops of the hives were insulated as well. The hives were provided with a reduced lower entrance and an upper entrance of approximately 1 cm X 7.5 cm in the inner cover. 
The colonies were left in well sheltered apiaries for the winter.'

They did however reference this gem:

Comparison of methods for wintering honeybees in the Prairie Provinces / Erdman Braun and John E. Geiger - https://publications.gc.ca/collections/collection_2016/aac-aafc/agrhist/A43-689-1955-eng.pdf

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