Window shoppers are confused by the two rival methods for measuring condensation resistance
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[](http://www.greenbuildingadvisor.com/blogs/dept/musings/rating-windows-condensation-resistance)
[](http://www.greenbuildingadvisor.com/blogs/dept/musings/rating-windows-condensation-resistance)
[](http://www.greenbuildingadvisor.com/blogs/dept/musings/rating-windows-condensation-resistance)
[](http://www.greenbuildingadvisor.com/blogs/dept/musings/rating-windows-condensation-resistance)
Condensation forms on a surface when the temperature of the surface is below the dew point of the air. During the winter, when the coldest surface in a room is often the window, it's fairly common to see water droplets or ice on window glass — especially in a room with elevated indoor humidity.
Condensation is more likely to form when indoor relative humidity is high. That's why it's more common to see condensation on a bathroom window than a bedroom window.
URL: http://www.greenbuildingadvisor.com/blogs/dept/musings/rating-windows-condensation-resistance
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