For our 6X6 coop with 7ft high ceiling, what's the lowest temp they can tolerate? The silkie rooster has lost his fluff so his head is bare. DH wants me to knit a hat for him. We have the Silkie rooster, a silkie hen, a rosecomb bantam and 2 eastereggers. 3 out of 5 are tiny little bantam chickens. We will be insulating the coop tomorrow, they are in the basement tonight just in case -12 is too low for them. With the heat lamp on, their water froze and the indoor thermometer read 30F. The tiny rosecomb was moving very slow, so I feared she was way too cold. What's your best advice for heating their coop? How warm do they need it? I am very thankful for any advice!