ENERGY STAR 

Windows & doors meet efficiency standards  and carry an NFRC ratings label.              

By sealing and insulating the “shell” 
of your home using Energy Star rated products it is estimated you can save up to 20%  
on heating and cooling costs  

Today’s glass technology can eliminate as much as 80% of solar heat gain while allowing nearly 80% of the sun’s visible light through 

GALLERY
The National Fenestration Rating Council   * N.F.R.C.  Label  

1. U-factor
How much heat can escape  through the window? Between 0 and 1 – 
the lower the number, the better insulation performance. 0.15 will insulate better than a U-factor of 0.30.

2. Solar Heat Gain Co-efficient (SHGC)
 How much sunlight can it block? Between 0 and 1 — the lower the rating the more heat is blocked. A SHGC of 0.35 will allow more heat to pass through than a SHGC of 0.27.

3. Visible Transmittance (VT)
How much visible light is allowed through? A rating of 0.50 permits less light transmittance than 0.75.The higher the number the more visible light is allowed to pass through. 

4. Air Leakage 
 How much air infiltration is permitted? Typically between 0.1 and 0.3, with a lower number indicating reduced air leakage.

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