So winter is quickly approaching and I'm a first time duck owner who needs to insulate the coop. I have two Rouens in a coop about the size of a horse stall (they have lots of space LOL). It's made of a single layer of wood and a concrete floor. I have a wire dog crate and some nest boxes that I put shavings in for them to lay on so they can get off the concrete, also so I don't spend a fortune covering the entire coop. I did take some foam filler in the can and filled some of the larger gaps but that's not enough I think. Over the windows I'm thinking I'll put up some clear plastic sheets to close them off. I'm thinking though, to save money and time, about making just their crate (or some other small box) insulated. Then they can go in and out as they please. Does anyone have some ideas for what I could do? I'd love to see what other people have done for the winter. Also how important is ventilation? I know it's important but since my coop is horse stall size and about 6.5 feet tall would that be enough to offset everything? If that makes sense. Thanks everyone!