I wrapped my run (8 x 14 ft) in heavy duty shower curtains. We've had a pretty bad cold snap here the past few days - 18 degrees during the day and down to 5 overnight. I need to overlap the curtains because the high winds kept blowing them around. In spite of that the coop stayed a bit warmer, never colder than 20 degrees. The run itself was only 15 degrees this morning when the outside temp was only 4 degrees. I removed their water at night, however, despite the cold, their water did not freeze up as bad during the day. Fortunately the weather is improving today so I can tweak the weather proofing. BTW: my run is covered with corrugated metal roofing. I'm thinking next Spring I'll put in another window on the south wall of the coop to help increase solar warming in the winter. I have 5 hens and a rooster (Rhode Island Reds) and they are doing well. 4 of the hens are laying every day now. Good Luck this winter and hope you all had a nice thanksgiving!