I currently have my 19 chickens and 4 ducks seperated. I am thinking about the coldest part of winter. I can only heat the chicken coop. I have no way to heat the duck house. It is my plan to let the ducks and chickens have run of my 2500 sq ft garden togther all winter and then seperate them again in the spring. I had just planned on seperate coop/house at night. We generally have about 1 to 2 weeks of temps that are below zero. The chickens will be nice and toasty but I am worried about the ducks.