When most people think about replacing their windows, there's one thing that people tend to focus on most with their new replacement windows: the glass. But there's more to energy ratings than the glass panes (and what's between them)... the rest of the window!
EnergyStar uses the U-Factor as an assessment of energy efficiency of a window. It's one of the most important ratings of any window. But they don't use center-of-glass U-factors and R-values. The reason is that center-of-glass values only measure the efficiency of the glass--not of the entire window as a whole. A standard U-factor (or R-value) measures the energy efficiency of the entire replacement window.
The frame of the window (and the sashes) can make or break the efficiency of a vinyl window. And there are ways to make a vinyl window stand out from the competition. One of the most effective ways is to insulate the dead air space between the vinyl. Not all window companies offer this, so it's important to make sure you're asking about it when shopping for your windows.
Of course, you can learn more about what makes up an energy efficient window by visiting one of our websites:
Windows Plus of Cincinnati
Windows Plus of Dayton
Thanks for reading!
Mike G.
The Window & Door Guy
