Definitions: U - Windows and exterior doors

U-value

Similar - thermal transmittance

A U-value is the overall heat transfer coefficient for an exterior facing component such as an exterior wall assembly, door, or window. The higher the U-value, the larger the amount of heat is transferred or lost through the object, for a given indoor and outdoor temperature.

References - U-value

See the following for additional U-value information:

• Windows United States Department of Energy, December 2009, Editorial Staff
• Exterior Doors United States Department of Energy, December 2009, Editorial Staff
• Carpentry & Building Construction, Student Text Sterling, January 2008, Marianne Cusato, Ben Pentreath, Richard Sammons, Leon Krier, ISBN 1402736282
• Carpentry Glencoe/McGraw-Hill; 6 edition, January 2003, Mark Feirer, John Feirer, ISBN 007822702X
• Green Building Products, 3rd Edition: The GreenSpec Guide to Residential Building Materials-3rd Edition ICC (distributed by Cengage Learning); 1 edition, October 2009, International Code Council, ISBN 1435400631

Service Professionals that can help with U-value issues

• Window and Door Installer
• Finish Carpenter
• Carpenter
• Handyman

Common projects involving U-value

• Remodel Home
• Add On to Home
• Restore Interior
• Renovate Home Interior

Hiring Local Professionals

Our FREE homewyse hiring guide helps you locate and hire great help, get quality craftsmanship and understand fair pricing on your specific project.

Help the homewyse Community

We're a cooperative community that values and depends on your input. So, let us know - how can we improve this site? Would your friends and online contacts benefit from homewyse information? Make homewyse better for everyone - send your feedback or share this page. Many thanks!

• Send your feedback or questions.
• Share homewyse on Facebook, Twitter or Google+ using the buttons below: