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State Required Energy Codes For Windows
Stewart can you help me out? I read a Monterey Park article regarding state energy code requirements for windows. According to the 2008 State Energy Code new windows need to meet the minimum values of Maximum U-Factor of 0.40 and Maximum Solar heat Gain Coefficient (SHGC) of 0.40. I’m looking at your paperwork and trying to figure out what’s what.
I am assuming that you want to know if your new windows comply with the stated code and factors. Great question and it is complicated so here is a somewhat simple answer. The good news is that they not only comply, but are better than what is required. The confusing part of this is in the way window performance factors are calculated.
The U-Factor and the Solar Heat Gain Coefficient are really ratios where the smaller the number is, the better the expressed value is. That is confusing because we are used to just the opposite where the larger the number is, the better, or in our case the more efficient it is.
On your Milgard quote labeled CTB each window will show the U-Factor and the SHGC values on the very first line. All of the windows that I sold you are equal to or less than .30 U-Factors and a .30 Solar Heat Gain Coefficient. Which is much better than the State required .40.
I hope that answers your question if you need or want more technical information I will be happy to provide it for you.