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There's been some great discussions this week on solar gain. But, is it temperature that kills or is it the moisture? If you wrap your hive to help promote a warmer temperature inside, won't it create a condensing environment for the warm, moist air when it contacts the cold inner cover?
 

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There's been some great discussions this week on solar gain. But, is it temperature that kills or is it the moisture? If you wrap your hive to help promote a warmer temperature inside, won't it create a condensing environment for the warm, moist air when it contacts the cold inner cover?
It's been said often that cold doesn't kill bees; moisture does. So we have to work with the principles of science to solve the problem you bring up. Principle: Convection. Warm, moist air is light, less dense and rises. (Cold air is dense and sinks) Provide an exit for this rising, warm, moist air and you don't have rain falling on the bees from the inner cover. Put some insulated foam board (with hole in the center coinciding with inner cover hole) on top of the inner cover and you help even more. Place a 4" ventilated super on top of the foam board, then outer cover, and problem solved. Works for me.
 
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