In cases where the inside temperature is below the outside temperature, a Low-E coating will allow the outside glass temperature to drop to about the same as that of an inefficient window. The Low-E coating reduces the heat transfer from inside, so the outside glass surface can cool significantly below outside air temperatures. During the winter, the inside glass is warmer because of the reduced radiant heat movement outward, and you don’t get that “cold” feeling sitting next to a window.) At night during the summer, heat is radiated from the outside glass to the cold sky and other objects.
(The outer glass can warm significantly in the sunshine. As the summer sun warms the outside glass, a Low-E coating reduces the amount of this heat that moves inward. Low-E coatings help reduce the amount of radiant heat transfer through a window.
DOUBLEPANE WINDOWS
The outside glass surface in energy efficient windows will be closer to the outside air temperature, while the outside glass of an in-efficient window will be closer to the inside temperature. When temperatures inside the building are within this range, summer condensation problems can occur. In the southeast US, summer dew point temperatures range from about 65F to 75F. Summer condensation occurs when the outside window surface is cooler than the dew point temperature of the outside air.
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