I wraped my hives with black felt(tarpaper) then styrofoam on 3 sides on the so. I built a 2 in frame and put a storm window over it, lets sun in and cold and wind off. any harm? Today 11-14-12 it was near 50 degrees and about 100 bees out, on another note , I watched for about 15 min and saw 3 bees come in with pollen and at least 4 drones