Quick question on this subject. I had 4 hives going into the winter, 2 with SBB's, and 2 with BB's. I meant to slide something in over the screens for the winter but due to going thru a divorce and other things I neglected the hives somewhat and never closed off the screens. 1 hive with a regular BB died and the other one survived and is doing okay but definitely not booming as the 2 with SBB's on them. I was amazed after seeing this. I thought they might have had trouble regulating the temps or whatever but they are thriving. So, should I have closed off the screens or not? I can't see where it hurt me to leave them off thru the winter and we had alot of weeks of some pretty cold temps plus quite a bit of snow and they seem to have flourished just fine. Any thoughts?