I am hoping someone else who has cold winters might be able to help me out. I live in colorado and it can get really cold at night during the winter. I was wondering if I should consider a heat lamp, or something else for them at night?? I've had chickens on and off for years and we've mostly figured out what they need over the winter, but I'm new to ducks. How cold would it have to be for it to be necessary for me to do something to keep my ducks (and goose) warm? They have a dog house that they go into at night, but as they wanted to eat the insulation when we first got it, it is no longer insulated (not because they ate it, but because we took it out). There are three ducks (2 cambells and 2 Cayugas) and one Buff Goose. Any advise would be wonderful.