I wrapped my one hive with a 2 inches layer of styrofoam with reflectix over that. Reflectix is a double bubble wrap with inner and outer layers of aluminum foil. I taped it on and sealed it with aluminum tape also as duct tape is not recommended over reflectix. It was almost 50 degrees on Friday and a lot of bees came out and were flying around in the back yard. They looked fine. I have a bottom entrance and a top entrance for ventilation. Yesterday we got 6 inches of snow and today its still snowing here in the Siberia of Iowa (NW Iowa). Edwin Geels :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::