"Although we now and again have to put up with exceptionally severe winters even here in the south-west, we do not provide our colonies with any additional protection. We know that cold, even severe cold, does not harm colonies that are in good health. Indeed, cold seems to have a decided beneficial effect on bees."--Beekeeping at Buckfast Abbey, Brother Adam
"Nothing has been said of providing warmth to the colonies, by wrapping or packing hives or otherwise, and rightly so. If not properly done, wrapping or packing can be disastrous, creating what amounts to a damp tomb for the colony" --The How-To-Do-It book of Beekeeping, Richard Taylor