These numbers have been in place for many years, last updated 2016 and represented a great performing window, with great savings.
You Can compare the current ratings to the left with the upcoming changes in Oct 2023 with Version 7. The focus seems to be on the reduction of U value which would benefit the colder part of the country, but doesn't benefit the southern portion much as they many more cooling days.
Click link below and put in your county to find out what you need to meet Energy Star
This represents the new changes coming targeting primariy reducing the U value of windows, which helps to retain heat INSIDE your home, lets radiant heat in through the windows and then blocks it from getting out.
Full Document detailing the requirements of windows
These enhancements however, don't come for free... the upgrades to any brand of windows to achieve these low U values and limit the reduction of Solar Heat Gain, (which doesn't save the South and South central much money at all) actually come at a enormous cost. Nearly a 100-200 percent increase in the purchase price of your windows.
Simply put the $600 in savings would not ever cover the added cost of one window you would purchase and the energy savings for you personally would never even come close to recoup in your lifetime.
The regular energy star windows are more than efficient if ROI is any concern for you. But, each house saves a nickel that can add up to a lot for the U.S Government on relieving some added strain to the power grid, with all the changes in electric cars ahead and limited capacity to the overall availability of power without adding new plants.
Energy Star Criteria for Products in Residential Draft 1 Version7 for Hinged Door Systems
Window Information
Sam Collins
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