When I started my muzzleloading rifle building "career", I lived in a 55' trailer in Masset, on Haida Gwaii, formerly the Queen Charlotte Islands. My shop was in a "Joey shack" attached to the entrance door of the trailer. It was unheated, and throughout the winter months the temperature in there was a few degrees below freezing. Water dripping down one of the back walls sometimes encased my file rack in a sheet of ice. But I worked throughout that miserable season...young, dumb, you know the story. I didn't experience any problems with wood changing as a result of humidity.