We have had weird weather lately in the Uk...down to -10...I have already lost two chickens who froze to death during the night...they where two of my resuced battery chickens.....I have really deep bed litter down...the sables doors and windows where closed...there are 50 other hens in there with them ..but they still froze due to the draught through the doors and the wind chill factor..now every night I put feed bags in the stable doors to stop the draughts .....so far it is working have not lost anymore....my little bantams in another shed won't come out at all......too cold for them.....hope everything goes OK for you all this winter...it is said theat February in the Uk is going to be even worse...dread to think of it....!