Window and door energy ratings are not totally understood by consumers, but they are critical to making a sound choice when considering which product to install. Let's face it, the average person may replace windows one time in their life and it is a lot to learn.
The National Fenestration Rating Council is actively making the process easier by educating consumers through brochures and a new website with "down to earth" language and in ways that everyone can understand.
The program is not new, but it is being pushed a lot more since it was developed in 2009. Understading the label and the various test results will help homeowner's make well informed decisions when investing in new windows and doors.
A = U-Factor (also referred to as U-Value) measures the amount of heat that escapes through the product.
B = Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight.
C = Visible Transmittance (VT) measures how much light comes through a product.
D = Air Leakage (AL) is indicated by an air leakage rating, expressed as the equivalent cubic feet of air passing through a square foot of window area.
E = Condensation Resistance (CR) measures the ability of a product to resist the formation of condensation on the interior surface of that product.
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