Create cozy rooms and cut at the same time energy costs when buying new Window Shades.
Understanding R-value
Building materials are assigned an R-value according to the product’s ability to resist heat movement.
- Window Properties
Window frames are typically metal, wood or vinyl. The R-value of a metal frame can be 5 to 20 percent lower than a wood or vinyl frame window. A single layer of uncovered window glass has an R-value of 1.75. Advances in glass coatings and assembly methods are improving the energy performance of new windows, but a window’s age, quality of construction, and the condition of sashes, weather stripping and caulking will impact how much air infiltrates or escapes your home.
- Window square footage
Windows make up 20 percent of the typical home exterior and 40 percent in contemporary construction. Numerous large, uncovered windows can break your energy budget when they’re on a cold north exposure in winter or a sun-saturated west wall in summer.
- Window Coverings
Heat moves towards cold. In the winter it’s drawn to cold glass to escape your home
(see illustration). In the summer outdoor heat moves toward the window of your air-conditioned home. The white exterior backing on all Hunter Douglas proprietary products reflects the sun. Using layers and cellular construction treatments at your windows can increase R-value by 1 to nearly 5 points. In extreme climates, that could save more dollars than you would spend to install windows with a higher energy efficiency.
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