24 Feb '16, 12pm

Building Science: What Is the Ideal Relative Humidity in Winter?

It was a little crackly around here recently. We had a cold spell in Atlanta, with high temperatures right around the freezing point. As a result, the indoor relative humidity dropped and we got some static electricity. Even better, what I call the Southern Lights were visible at night, too. (I've never called it that before, but hey, a man named Allison is entitled to make things up on the spot.) That's when the microfiber blanket on the bed lights up every time I move. Why is the humidity low in winter? I've written about the reason for this before. Basically, it's that cold air is dry air . The lower the temperature, the less water can exist in the vapor state. You may have a high relative humidity, but the actual amount of water vapor in the air (sometimes called absolute humidity but better characterized by something called the humidity ratio) will drop as the tempera...

Full article: http://www.greenbuildingadvisor.com/articles/dept/buildin...

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