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What Is A Good U-Factor For Replacement Windows?

I need to replace my windows and would like them to be as efficient as economically feasible. Should the u factor be high or low? Also, what does the solar heat gain coefficient mean?

This is a great question that a lot of people get tripped up on.

U-factor (or U-Value) measures the rate of heat loss through the window. It reflects the total performance of a window because it is determined from all of the window components. R-factor only measures the performance of individual parts (like the glass). So U-value is more important because it measures how all the parts work together.

A lower U-factor equals better energy-efficiency.

Solar Heat Gain Coefficient (SHGC) gauges how much heat is absorbed by a window and transferred into (or out of) your home. It’s represented as a number between 1 and 0, with 0 being the least amount of heat. You want a number closer to 0.

It’s good that you’re reading up on these numbers. The new Energy Tax Credit for replacement windows and doors raises the U-factor and SHGC requirements needed to qualify for the credit. You can read more about it here: 2009 Energy Tax Credit for Windows and Doors

Mr. Rogers Windows carries a wide variety of replacement windows and doors that qualify for the tax credit.

Gerry Rogers About Gerry Rogers

Gerry Rogers is the President of Mr. Rogers Windows

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