I'm not sure keeping the window open is such a good idea, as you're just letting cold dry air in, and letting warm moist air out. The furnace doesn't take any moisture out of the air. What happens is the relative humidity drops when you heat air up. This means the air feels drier because it can absorb more moisture when it is warm. With the window shut, the humidifier and your breathing will fill up the air's excess absorbtion capacity, and increase the absolute and relative humidity. By opening the window, the moisture from the humidifier and your lungs will leave the room. The cold air outside may have a high relative humidity, but it has a lower absolute humidity on a per volume basis than the air you are letting out of your room.
Static electricity in a fireworks factory - now THAT'S a serious problem!!!!
Static electricity in a fireworks factory - now THAT'S a serious problem!!!!