U-factor
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Choosing Window Glazing
How to specify the right U-factor and SHGC for your climate zone
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European vs. U.S.–Manufactured Windows
It's impossible to compare European window U-factors to American window U-factors
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Understanding Thermal Numbers
Another explanation of R-, U-, K-, and C-values
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Windows for High-Altitude Homes
How to specify insulated glazing units that can handle changes in atmospheric pressure
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What Do Windows Do?
Windows have a great many functions—and a few quirks
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Three Code-Approved Tricks for Reducing Insulation Thickness
Savvy builders know that there are several legal ways to install less insulation than the minimum requirements in the prescriptive code table
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All About U-Factor
It’s not a simple topic, so get ready to untangle a few knotted threads
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Installing Closed-Cell Spray Foam Between Studs is a Waste
Why open-cell foam makes more sense than closed-cell foam between studs
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How to Order Windows
Things to consider before you choose windows for your new home
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Comparing North American Window Frames to European Frames
Thin North American window frames with a high U-factor sometimes perform about the same as European window frames with a lower U-factor