My brother-in-law brought one into his shop after it had sat in freezing temps for a couple of months. One day after work he fired up his wood stove to heat the shop so he could do some work after dinner. When he went out an hour later, he started to work on a project. Something started buzzing around him and he realized the hornets had started to leave the nest. he immediately shut down the stove and went in the house. After a couple of more freezing days, he went back out and shot ether in the nest, when it was a little warmer, he coated it with shellac. It turned out pretty nice.