Do not do this. Heat lamps are dangerous and are the most common cause of a coop burning down. Also, if power is lost and the birds are plunged into sudden cold without having been able to acclimate to it, they WILL die.
Ugh pyxis, PREACH. I have been trying to convince mr baunlee that a heat lamp in the coop isnt needed. I think right now he is so exhausted from work that he has given up the fight. I hope I have worn him down over the years. Hopefully this year I can succeed to our first year without heating coop. I'm back from school now so I have more pull. haha Buffalo though...cold as evah