Is this for now or when they get older? For now i was planning on letting the older ducks outside in the duck house during the day and bringing them inside at night. Their duck house is made out of untreated plywood but we water proofed the outside. I made it myself so i does have some small gaps in between the planks. The bedding is pine shavings. Today is the first day of fall so the temp will be dropping. Yes they do huddle together and when i put them in the duck house today for a few hours ( it was nice and warm out today) they were cuddling together near the food. I looked up the temp for tomorrow and its supposed to be high 50s and low 60s.