I live in Denver, CO and it has been REALLY cold this winter! It is -5F this morning and one of my girls isn't looking so hot. I do not heat the coop and they have been fine even when it got down to -20F, but when I see them looking all cold and miserable my heart just melts! I read an article in our paper about using a low wattage CFL bulb in a cage with a outdoor extension cord just to give them a little break in the morning (when I can monitor for fires etc) from the cold. I have good ventilation, no draft, and keep the coop as clean as I can. I do not want to create a dependence on a heat source and I"m aware of the fire safety concerns, I guess my chicken mom heart is just too big! Thoughts on the CFL idea? thanks!