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WHAT IS AN R-VALUE?

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R-value is a measure of how effectively insulation, windows or another building material resists heat flow. Generally, the higher the R-value, the greater the product’s insulating power.

You’ll run into R-value when you buy windows or insulating products for your attic.

Windows
When you are blasting cool air in the summer, your windows might be letting a lot of it escape to the outdoors.

Most U.S. homes still have single-pane windows that let the sun’s hot rays in during the summertime, making air conditioners work overtime. They have an R -value as low at R-1.

Rosie recommends a double-pane window with a high-performance coating, which can have an R-value of up to R-5. Choose a window with a low-emissivity (low-E) or spectrally selective coating, will prevent the heat from penetrating the glass in the summertime.

R-value is a measure of how much heat can get through the window in an hour. Windows with a high R-value allow less heat to enter your home. The greater the R-value, the greater your energy savings will be.

Read more…

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