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3398 Washington Road
Atlanta, GA 30344
USA

773.398.5288

Advanced residential construction and home improvement consulting and owner's advocacy in Atlanta, using the latest building performance diagnostic and modeling techniques and tools. Airtightness, insulation, HVAC, ventilation, moisture, and air quality and EMF consulting for homeowners and building professionals alike.

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Home performance articles and stories from the field with internationally respected building forensics guru Corbett Lunsford at the Building Performance Workshop. Hear new episodes of the Building Performance Podcast, see new videos from the Home Performance YouTube channel, and learn all about how diagnostic testing (more than an 'Energy Audit') can make home improvement and new home construction a proven process!

WINDOWS: Convert from European U-factor to Imperial U-value for Americans

Corbett Lunsford

It’s simple- divide the European U-factor by 5.555

The Euro value is in different units- W/m2·K, and in American software modeling we need U-value that’s simply 1/R-value, aka Btu/h·ft2·F.

So for example a European window U-factor of 0.5 means:

U-0.5 divided by 5.555 = U-0.09 in Imperial. Or an R-11 window, which is amazing. A U-0.5 window in the U.S. means R-2, which is a standard terrible air-filled double pane window.

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