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Frequently Asked Questions About Energy-Efficient Windows

Did you know that heat gain and loss through windows make up 25 to 35 percent of residential heating and cooling energy use? This is why it’s important to choose the most energy-efficient replacement windows for your climate. However, this task can be challenging and sometimes confusing.

In this post, we’re answering the most frequently asked questions about energy-efficient windows.

What Makes U-Value Different from R-Value

R-value is used to measure how well a certain type of insulation can resist heat flow. Walls with higher R-value provide better insulation. However, R-value doesn’t pertain to windows and other fenestration products. U-value refers to the amount of energy transfer that occurs in windows and doors. The lower the U-value of a window, the more energy-efficient it is.

What Is Insulated Glass?

Insulated glass units (IGUs) have two panes of glass separated by an inert gas. Most modern structures use insulated glass on windows and doors. IGUs are also called double-glazing or double-pane glass windows.

What Gases Are Used in IGUs?

Gas in between window panes prevent heat transfer. The gas used in IGUs varies with different manufacturers. A window company may use argon, krypton or a combination of both. Gas is a better insulator than air, increasing the window’s thermal value.

What Is Low-E Glass?

Low-emissivity or Low-E glass is coated with a virtually clear material that reduces ultraviolet ray transmission. This glass makes windows more thermally efficient, eliminates glare and prevents the damaging effects of UV rays cause to furniture, floors and decor. Low-E can help cut your energy costs, especially if you live in an area with long, hot summers.

Whether you need new double-hung or casement windows, you can count on Renewal by Andersen® of Kansas City. Call us at (913) 385-1300 or fill out our online form to schedule a free in-home consultation. We serve homeowners in Kansas City, MO

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