I've got 6 swedish flower hens that are almost 3 months old. They sleep in a small insulated coop with deep bedding and no roosting bars. After an unusually mild fall, we have a brutal cold snap coming in this week with single digit lows.... I have 2 questions relating to this- 1 am I overdue in adding roosts? They've seemed content sleeping in the bedding so far. 2. Will the cold snap be too much for them? I'm a first time chicken owner and would appreciate any input I could get! Thanks!