I live in zone 6 where temps drop below freezing in the late fall and winter. Some below 0 Fahrenheit weeks are common too. I have a broody duck sitting on her clutch next to the house. She picked an inconspicuous location in a corner but its still not protected from the elements. I tried moving the nest to the cedar doghouse that the ducks where originally raised in but she refused to sit on them in there so I returned them to her nest. Instead of touching the eggs again my son and I built "quack shack 2" from plywood around her nest. It's equipped with a 30 watt heat lamp, mini water feeder and so far she's happy in there. My question, being concerned with the low temps, should I insulate the little 2'x3' with some straw or put some kind of flap over the entrance to keep the heat in better? I just remember buying the ducklings in the hot weather of August and they where in a shed running around under a big heat lamp?! Do they need all that heat or will mama duck take care of all that?