As I write this post at the end of November, our outdoor temperature is 28°F with an outdoor humidity of 75%. Inside my home, the temperature is 70°F with a humidity level of 21%. Slightly uncomfortable humidity levels for my family. During last year’s polar vortex, when the temperatures reached nearly -40°F, my indoor humidity dropped to 9%, much too dry. Knowing what I know about building science, I will not operate a humidifier. This post will explain why. Continue reading “Building Science-Wintertime Interior Humidity”