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 Post subject: Low E value
PostPosted: Wed Oct 07, 2009 6:55 pm 

Joined: Wed Sep 30, 2009 6:14 pm
Posts: 5
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On the nfrc site under Low-E, what does a .207 vs an .024 signify and is either number indicative of a better window?


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 Post subject: Re: Low E value
PostPosted: Wed Oct 07, 2009 7:28 pm 

Joined: Sat Feb 10, 2007 11:51 pm
Posts: 1579
Location: Northern,Virginia
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It's either a .27 or a .24. That number indicates either the U-factor or the Solar Heat Gain Coefficient. Whether higher or lower is better depends on where you live. There would not be much of a difference in heating and cooling costs between the 2.


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 Post subject: Re: Low E value
PostPosted: Wed Oct 07, 2009 10:03 pm 

Joined: Wed Sep 30, 2009 6:14 pm
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I am not referring to the U factor. This number is located under the column label of Low-E and states .027(2) with an OKNA window and .204(2), .204(5) for a BF Rich window.


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 Post subject: Re: Low E value
PostPosted: Thu Oct 08, 2009 6:11 am 

Joined: Tue Nov 06, 2007 7:20 pm
Posts: 186
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That number is the Emissivity Value of the glass. How much heat it absorbs and emits. The number in () is the surface or surfaces the coating is located. A lower number indicates the glass will have more reflective properties. I would still put more weight on the overall U-vale of the entire window when making a buying decision.


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