Windows

Vinyl 220 Series

Impact 4000 Data Sheet with options – http://www.krestmark.com/wp-content/uploads/2014/08/Impact-SS2.pdf

Krestmark energy performance data:

http://www.krestmark.com/wp-content/uploads/2014/06/U-Factor-and-SHGC-data_Layout-1-1.pdf


Table below is from http://www.efficientwindows.org/energystar.php with the required properties for a product to be Energy Star Rated.

Southern Zone Required Properties (mostly cooling)
U-factor Solar Heat Gain Coefficient (SHGC) Visible Transmittance (VT) Air Leakage (AL)
Windows: U?0.40
Skylights: U?0.60EWC Recommendation: A low U-factor is useful during cold days when heating is needed. A low U-factor is also helpful during hot days when it is important to keep the heat out, but it is less important than SHGC in warm climates.
Windows: SHGC?0.25
Skylights: SHGC?0.28EWC Recommendation: A low SHGC is the most important window property in warm climates. For superior energy performance, use windows with a SHGC of 0.25 or less.
Windows: VT=No Requirement
Skylights: VT=No RequirementEWC Recommendation: Select windows with a higher VT to maximize daylight and view.
Windows: AL?0.30
Skylights: AL?0.30EWC Recommendation: Select windows with an AL of 0.30 or less.

U=U-factor in Btu/hr-sf-°F
SHGC=Solar Heat Gain Coefficient in fraction of incident solar angle
VT=Visible Transmittance in fraction of incident visible radiation
AL=Air Leakage in cfm/s