One of the first things you may notice when shopping for new energy-efficient windows is they typically have a sticker on the front with a whole bunch of numbers to decipher. For those who have never purchased windows before, this can be confusing!
Luckily, Alex Ignatenko of American Vision Windows & Solar, a member of our network of contractors, is here to explain what to look for.
The numbers indicate a replacement window’s u-factor and solar heat gain coefficient (SHGC). The u-factor measures insulation values, which generally range from 0.25 to 1.25. The SHGC measures the solar energy transmittance, with values generally ranging from 0.25 to 0.80. Watch this video for an easy tip on which numbers to look for to maximize the energy efficiency in your home!
Dan Sachoff: So Alex, as I was looking at these new windows here, I saw all the numbers here on the sticker on the front. What are we looking at?
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Alex Ignatenko: So the .27 is called the u-factor. The U-factor measures insulation value. The lower that number, the better it is.
Dan: Fantastic. So we have a u-factor number of .27 and solar heat gain .22, so those are great numbers.
Alex: Yes, the solar heat gain coefficient also measures the amount of solar heat that shines on your window. Again, lower numbers and you won’t make the wrong decision.
Dan: Fantastic, I knew I liked these windows.