When we have had very cold temps (single digits and below zero) I have not done anything different for my chickens. The temp has dropped to 20 degrees in the coop and since I keep the water open (I have a warming base for their water) they seem just fine.
When I check on them, even when its 20 degrees in the coop, their mood is fine. When I reach through their feathers and touch their skin, they are toasty warm.
We added some more straw for them and made sure they had enough food and water.
I don't know if a chicken's breed helps... I have RI Reds which we got purposely because of their egg laying skills and adaptation to colder weather.
When I check on them, even when its 20 degrees in the coop, their mood is fine. When I reach through their feathers and touch their skin, they are toasty warm.
We added some more straw for them and made sure they had enough food and water.
I don't know if a chicken's breed helps... I have RI Reds which we got purposely because of their egg laying skills and adaptation to colder weather.