Yep location will help, but regardless make sure there's enough ventilations above. With your 8 chickens, I assume you have big enough (height +room) coop for proper air flow above & their heads not too close to the roof of the coop. Make sure the coop is dry and not drafty, I get 0-20*F in the winter w/ occasional below zero though my 1st Year w/ chickens were mostly -10-20 but non got frost bites specially the leghorns (big combs) keeps my 4 coop windows partially open 90% of the time and the pop door to the run open 24/7 so the chickens can decide to go in and out. Though I put clear plastic around my run to prevent snow and rain blowing in.