I have one winter with ducks under my belt. I live in the UP of MI and we do get double digit below zero temps. Our coop is not insulated, but is solidly built and I do have a heat lamp, but it was only on for days and nights when we had windchill warnings for -25 or colder. The ducks actually still spent most of their time out in the run. I did put straw down outside, so they could lay somewhere out of the snow. I never had any problems with frostbite or anything. I had 2 ducks who laid an egg every single day, no matter how cold. The others were less regular. Every egg usually froze solid before I could get out and collect them though. They really didn't seem to like wandering through the snow. We shoveled them a path and spot outside their run for their water tub. I used a stock tank heater and a heated dog bowl. The dog bowl died about halfway through the winter, so always make sure you have a back up plan for water. I had a heated bucket as well, that has lasted just fine. I bought a heated hose for next winter, keeping my hose thawed was a constant struggle. I actually used the heat lamp much less than I thought I would, they didn't seem to need it. I kept a thick layer of straw in their coop and added more often so it wasn't all dirty and flattened out. It was horrible trying to clean that straw out of their run this Spring though. I might have to figure something else out for this Winter.