We wrapped the run in plastic, leaving the top open for air. DH put a roof on the top of the run, based loosely on the "playhouse" design. The savannah playhouse has insulated foam boards in the walls and the roof. The girls seem to be holding up okay - our highs this week might make 20. Last night's snow wasn't as bad as Christmas Eve ... had drifts halfway up the little house door. I know many of you have it worse, but we are SO not used to this much frigid weather all at once! How are the rest of you holding up?