There's nothing to worry about those conditions -- they're fine well below freezing as well.
Your main concern with cold weather is to reduce drafts and making sure there is water available in liquid form! And please try to refrain from adding a heat lamp. They do just fine huddling up with each other -- you don't need to introduce a potential fire hazard. Last year we had a cold snap and two... TWO houses in our general area had coop fires from a poorly placed heat lamp during the same night! Fresh liquid water and plenty of food is all they need.
It's hard not to worry about them though, while I sit in a warm house.
Your main concern with cold weather is to reduce drafts and making sure there is water available in liquid form! And please try to refrain from adding a heat lamp. They do just fine huddling up with each other -- you don't need to introduce a potential fire hazard. Last year we had a cold snap and two... TWO houses in our general area had coop fires from a poorly placed heat lamp during the same night! Fresh liquid water and plenty of food is all they need.
It's hard not to worry about them though, while I sit in a warm house.