Replacement Windows and Air Infiltration – The Forgotten Window Rating
When deciding to purchase replacement windows, there are many factors to consider to make the best purchase. Many window sales people will point out the obvious: aesthetics, “cool features” like tilt wash windows, and warranty. As consumers get more energy conscious, another factor comes to the forefront when choosing to replace windows: window ratings. While many window salespeople will focus on the big two: U values and Solar Heat Gain Coefficient, there is another important factor to consider when selecting windows: air infiltration.
Air infiltration does not get its due when considering replacement windows, but it is a major culprit for heat gain and loss in a home. An older window does not seal as tightly and creates the opportunity for air to enter into the house. People refer to this as a “drafty” window in the winter because the cold air is easily entering the room. Heat also enters the house in the summer through cracks, however, many people mistake this for the heat coming in through the inefficient glass.
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