Window Ratings
RICHARD J. STICHLER GENERAL CONTRACTOR
Lebanon, PA 17046
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Remodeling, Custom Building, Complete Home Improvements, Custom Cabinetry
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Understanding the National Fenestration Rating
Council (NFRC) Label.
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The NFRC sets the standards for every door
and window produced. This guide is intended
to help you understand what the ratings mean.
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U-Factor measures how well a product prevents heat from
escaping a home, taking into account airflow around the window and
emissivity of the glass. U-Factor ratings generally fall between 0.20
and 1.20. The lower the U-Factor, the better a product is at
keeping heat in. U-Factor is particularly important during the winter
heating season.
Solar Heat Gain Coefficient (SHGC) measures how well a product
blocks heat from the sun. SHGC is expressed as a number
between 0 and 1. The lower the SHGC, the better a product is at
blocking unwanted heat gain. Blocking solar heat gain is particularly
important during the summer cooling season.
Visible Transmittance (VT) measures how much light comes
through a product. VT is expressed as a number between 0 and 1.
The higher the VT, the higher the potential for daylighting.
Air Leakage (AL) measures how much outside air comes into a
home through a product. AL rates typically fall in a range between
0.1 and 0.3. The lower the AL, the better a product is at keeping
air out. AL is an optional rating, and manufacturers can choose not
to include it on their labels.
Condensation Resistance (CR) measures how well a product
resists the formation of condensation. CR is expressed as a
number between 1 and 100. The higher the number, the better a
product is able to resist condensation. CR is an optional rating, and
manufacturers can choose not to include it on their NFRC labels.
