I use deep straw in nests and even that's not enough insulation to keep eggs from freezing after a few hours at 0F.
Hens can often keep them warm during peak laying hours in the favorite nests.
Am grateful to be able to gather frequently......
.....cause ain't getting many eggs this time of year and I need them all to pay for feed.
If you have power in your coop you could always go the way @RonP did:
https://www.backyardchickens.com/a/heated-nesting-boxes-help-stop-frozen-eggs
Hens can often keep them warm during peak laying hours in the favorite nests.
Am grateful to be able to gather frequently......
.....cause ain't getting many eggs this time of year and I need them all to pay for feed.
If you have power in your coop you could always go the way @RonP did:
https://www.backyardchickens.com/a/heated-nesting-boxes-help-stop-frozen-eggs