Their yurt was insulated. It wasn’t insulated as well as their mountain dream home. But it wasn’t like camping, either. In the winter time they had temps as low as minus 20. On a night like that they had to keep the fire going, someone might get up at 3am or so to make sure it didn’t go out. But as long as the fire is going they were fine. They also all sleep up off the floor and had nice heavy homemade quilts on their beds.