What do you think of most stringent U-factor number being considered for 2009 criteria?

John G. Swanson
January 23, 2008

Another update from DOE provides a little more insight into potential changes to the Energy Star window, door and skylight criteria. The government is still waiting to see what ICC might do as far as tightening energy codes first, but some possible numbers are being shared.

So I thought I’d use this week’s poll to get your feedback—and, since I just came from the Northeast Window & Door Association meeting, I’ll focus on the number that most interested its members. DOE is looking at requiring a U-factor as low as 0.30 for its Northern climate zones in order to qualify for an Energy Star label in 2009.

There are plenty of other proposals and numbers to discuss, and we hope to that in the coming weeks. In addition to votes, we’d like to hear your specific thoughts. What do you like or dislike about the numbers, and any of the other changes being considered? So email me about any or all the DOE proposals. Let’s start a discussion.

For poll results and industry feedback about this topic, click to the next page, and read Page 2 of “The Talk...”


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I keep hearing about U factors of .32, .35, .20, .15 and how they will save me all this money.

What I would like to know, is my current windows have a .38 U factor, and my wife and I are considering replacing them with new windows.  If we were to go to a .32 U factor and all other factors staying the same.  What could I expect to save per year?  Most of my windows are 32 X 69. 

Is there enough saving to warrant the expense. 

Based on the Energy Star maps I live in the northern region.  We heat with natural gas, and use window air conditioners in the summer.  We have just had the rest of the house insulated with blown in insulation.


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