Question about natural gas? I was wondering if anyone knows how much moisture is in the natural gas that comes in to your home. Now around here it was - 30 or so with the wind chill the last few days. I went out to feed the birds, and noticed that the screen on my chimney cap was frozen over on 2 sides. I have never seen anything like this before, and I use my GD's air rifle ( her mother will not allow her to keep it at home so it stays here) to shoot the ice off both sides. So the question is this how much moisture is the gas company permitted to allow in the lines? Has anyone else ever seen this happening?