I have my two in a dog kennel at night. One of the solid plastic ones with a hinged metal wire door. This will keep the wind out, and I have a tarp over it for a little extra insulation. I put leaves in it for warmth and comfort, but should I build something else that I can put a lamp in to keep the temp comfortable?
Hay bales are an excellent insulation. You can put it underneath and over the dome to keep the warmth in. Quite honest they don't really need it if they get wind protection. I have an insulated house for my ducks and actually keep a heater in it at around 40-45 degrees. I do this for egg production only, otherwise they would not get any.
