How to manage a flock of 2 in a New England Winter...

I just had a fox get 6 of my girls yesterday afternoon. Didn't do anything but kill them. One flew away and thankfully came home this am without a feather out of place. The other survivor I'm working with my vet to treat her wounds.... Right now, they are in a large rabbit cage that needs to be cleaned a few times already. I'm borrowing a extra large dog kennel as a temporary solution. We are going to be building a new coup and run, but in the meantime, for safety and cold (it's getting below freezing now at night)-are they even going to be able to be in a coup with just 2? The temps in Winter get to be below 0 degrees on a regular basis.... I'm not comfortable with them being outdoors... Any suggestions on how to house them comfortably without well not-so pleasant odor? Any suggestions would be helpful.