Low E2 vs Low E 366


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Old 07-13-20, 08:53 PM
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Low E2 vs Low E 366

So just noticed on my order for my second window the description of the glass is Low E2. My first window was described as Low E366. I'll be calling them tomorrow, but any idea what the difference is? Which is better? Hopefully the 366 is better since it has been installed and it's their mistake.

I tried the googling but there wasn't a clear answer.
 
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Old 07-13-20, 11:20 PM
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By the 1990s, window makers were adding a second metallic coating to create low-E2 -- or low-E squared -- windows. In 2010, manufacturers introduced low-E3 -- or low-E cubed -- windows, which feature three coats of metal to further reduce solar heat transfer through the glass.

Comparing low-E2 and low-E3 windows begins by comparing how much light is transmitted through the glass. Typically, the more layers of low-E coating applied to a window, the less natural light is able to enter the home. For example, a single pane of uncoated glass has a visible transmittance, or VT, rating of 90 percent, which means 90 percent of visible light enters through the glass, while 10 percent is reflected back out. A standard low-E2 window has a VT of 70 percent, compared to 66 percent for low-E3 windows


From SF Gate - E. Beach©
 
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Old 07-14-20, 05:11 AM
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https://www.cardinalcorp.com/product...ss/loe2-glass/
https://www.cardinalcorp.com/product...glass/loe-366/

Yes 366 is slightly superior. The biggest difference in the two is that the 366 has low e on surfaces that result in better numbers when it comes to UV fading and heat gain coefficient.

Occasionally dealers will mix them up if the window mfg has a promotion (free upgrade) or on north facing windows that never get direct sunlight vs east, west, south windows that do. There is next to no heat gain (from the sun) to worry about on north facing windows.

There is also a slight difference in the shading coefficient, how much light is let through the glass. But I'm not sure that the minuscule difference would be visible to the naked eye.

I would not be concerned about the difference one bit.
 
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Old 07-14-20, 07:12 AM
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Ok, so if I am understanding those three articles correctly, LoE 366 is LoE 3...3 layers of silver magic, and can be referred to interchangeably. LoE2 is just referred to as LoE2 (2 layers of silver magic)?
 
 

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