If you live in NC, 32 degrees is cold but if you live in Alaska it is shorts and tee shirt weather. I get the biggest charge out of the raft of "cold weather has set in" threads were people are concerned about their chickens when the temperatures are dropping into the 40's at night. While this may feel chilly to you, your chickens are fine--as long as they are fully feathered out--and will be even when it gets considerably colder. While there are a lot of threads in regard to cold weather care and I'm not about to repeat them here, I'd like to say that keeping your birds happy and healthy all winter is not done by adding heat but by giving them a dry, well vented but not drafty, coop with plenty of food and unfrozen water. As far as 20 or 30 below temperatures are concerned, given their nice warm downy coats, most winter hardy birds will be a lot happier than you will be. Don't worry so much.