I would offer them outside. If it's near 10 above, I will give the ducks the option of some fresh air while I do room service. They last anywhere from 2 to 5 minutes usually. Time enough to get a few things picked up, and a little fresh air into the shelter.Mine are good. It's 8 degrees and the sun is out. Going to check their water and food. Should I let them out of their coop for a while since the sun is out but it's still only 8 degrees. This will be today's high!