Q: What does it mean if a window is Energy Star qualified?
What does Energy Star qualified mean for windows? What energy standards does a window have to meet to get this rating? And, in practical terms (money or energy savings), what does this rating mean for me? Thanks for the info.
A: Energy Star Qualified Windows
From the energy star website:
ENERGY STAR qualified windows, doors and skylights reduce energy bills by about 7-24 percent
The primary number you want to look at is the windows U-Factor. To qualify for the newest energy efficiency tax credits you a window must have a U-factor of .3 or less. Hope this helps.
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A: energy star window
Windows are energy star rated according to climate. There are maps showing zones on most manufacturers websites also on http://www.energystar.gov/ to get exact info for your location. Important to understand not all energystar rated windows are not eligible for the 2009/2010 tax credit.
The U-value( think of insulation value of window, lower the number the better) must be under .30 and the SHGC-value or solar heat gain coefficient ( this number describes how much of the suns energy is transferred through glass) there are different theories about this and what is better for each climate zone. The lower this number less of the suns energy is transferred through. A negative is the lower the number also reflects less light tranfer through glass. To meet tax credit this number must also be below a .30.
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