#Andersen windows r value how to#
In fact, some companies might charge you more if you want windows with glass that provides less insulation, including models with only air-filled glass or with no low-e coating.Įssential information: Learn how to choose the best windows, understand the different window types and designs, and find an expert installer. It's worth noting that many manufacturers of high-quality windows, including all those we tested for our latest report on windows, now use argon-filled glass as the standard for their windows. However, homes in cold climates tend not to see a benefit from this option. Studies have shown that windows with a low-e coating can measurably reduce solar heat gain during cooling season (assuming you do not draw curtains or blinds anyway). Designed for new construction and replacement projects, the windows can achieve a U-factor as low as 0.15. By increasing the R-value from 3 to 5, average heat loss through the window is reduced by 30 percent to 40 percent. UV light from the sun can damage your furnishings but, more important, infrared radiation transfers heat into or out of a home. As a comparison, Energy Starrated windows typically hold an R-value of 3. What's more, the argon does little or nothing to reduce transmission of ultraviolet and infrared radiation. This small increase in insulating value from the argon gas will get you slight energy savings, but the additional initial cost could significantly extend the payback time for the windows. Learn more about the energy performance of windows.) R-value is the measurement of thermal resistance the higher the number, the more efficient the window. (Insulated-glass windows, also called double-pane glass, typically have an R-value of around 2.0 to 3.0.
Argon, for instance, typically increases the insulating R-value of a window by only half a point. Large incremental costs for these options generally outweigh their benefit.
But if you need to replace irreparable windows or are undertaking a home remodel, then consider the incremental costs of higher-efficiency replacement windows over models without such features as specialty gas fills, including argon, or low-e coatings. It is generally not a good investment to replace windows just for energy-efficiency purposes. Should I spend more to get the argon gas? The replacement windows I'm considering buying come with the option of using argon gas to boost their energy efficiency.
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