Thursday, May 15, 2008

Energy Efficiency and Hurricane Windows – Part II

As we discussed in our previous post, when purchasing windows, including hurricane windows, it is important to know about three key glass properties: the SHGC, U-Factor and VT (for term definitions, please read our previous post). Below, we would like to show you how these glass properties vary as you change the thickness and/or tint of the window glass. You will notice that we chose the 5/16-inch, clear glass as our window point of reference in terms of price. This window is our starting point, giving it a value of 1. The "Price Ref." column shows the additional price, presented as a percentage, to pay for upgrading the tint or the thickness of the glass. For your information, all of the windows in the example below are hurricane windows (i.e., impact-resistant windows).

On the table above, you notice how you can improve the SGHC by adding a tint to the window glass. It is also important to highlight that even without a tint, hurricane windows offer a significant reduction in solar radiants. For example, the 0.63 factor means that 37% of the solar heat is block by the clear glass window.

Visit Astor Impact Windows for information about purchasing impact windows and doors. You can also email us at or call us at 1-800-573-1780.

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