Atlanta and North Georgia since 1925

Emtek Door Hardware
Fine Finishes for Fine Homes
Atlanta Vinyl Windows
Silverline Windows and Doors
Atlanta Windows
Lincoln Windows
Atlanta Doors
Tucker Door and Trim Company
Atlanta Windows
Georgia Window Company
Atlanta Doors
Therma Tru
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Consumer information

window information

NRFC provides information that can help when selecting windows and doors. Click on the logo to visit their website.

Ever wanted to know what those numbers mean on the sticker on your new window?
Here is the scoop.
  • U factor: or U value: This rating measures how well a window prevents heat flowing through it. This rating scale ranges from .20 to 1.20. Look for the lowest rating, as this means that a window allows less heat to flow through.
  • Solar Heat Gain Co-efficient (SHGC): This rating measures how well a window blocks heat caused by sunlight. The SHGC rating scale is between 0 and 1, with lower ratings indicating less heat transmitted through the window. This rating is important for windows exposed to direct sun.
  • Visible Transmittance (VT): This rating measures how much light penetrates through a window. This rating scale ranges between 0 and 1. The higher the rating, the more light comes through.
  • Air Leakage (AL): Used for measuring how much air leaks through a window assembly, this rating is useful for selecting windows that conserve energy. The lower the AL rating, the less air potentially leaks through.
  • Condensation Resistance (CR): Condensation trapped between glass layers is frustrating; the CR rating measures a window's ability to resist condensation on its interior surfaces. Rated between 0 and 100, a higher rating indicates that a window is less likely to form condensation.

Compare and use window ratings as tools for choosing new windows based on your needs. Manufacturers are not required to use the AL and CR ratings; if this information is important to you, ask window dealers to direct you to products that include these window replacement ratings.