what is everyones opinion on this. i live near green bay wisconsin so our winters get pretty cold. i read in this email i get from some company (can't remember the name), but they said do not heat coop cuz if the electricity suddenly goes out, the change in tempurature will shock the chickens and possibly kill them. so now i'm afraid to heat my coop. my coop is 5 1/2 ft by 5 1/2 feet and built up against the garage. i have 4 chickens. they are a rhode island red, buff orphington, a small grey cochin, and a hybred of some kind. so fairly all large birds except for the cochin. and i do give them cracked corn first thing in the morning and again about 1 hour before they get locked up at night. so what is everyones opinion and suggestions on this. thanks ahead of time.