It was quite cold last week and we started to worry about the hens for winter. I blocked the the bottom of the henhouse door off and added another 6" of shavings to make a total of 12" or so. The girls LOVE it. It is hot today - over 80 - but they are in there, happily nestled in almost up to their necks, lolling around like they do in the dirt when out grazing. When they're out in the yard you can see big divots in the shavings where each of them snuggles in. I'm expecting it will be good when it gets cold and I'll keep turning them over and adding more shavings.