January 1, 2018

There are a lot of fancy and confusing words thrown around when people start talking about windows. Sometimes it’s hard to know what is important and what is just a selling point. Two of the most commonly heard, and misunderstood, terms used today are ‘R-value’ and ‘U-value.’

At Bavarian Window Works, we don’t want you to be confused, so we’ve broken down all you need to know about these two important terms.

What is R-Value?

The formal definition of R-value is ‘a measure of the resistance of an insulating or building material to heat flow.’ The higher the number, the greater the resistance to heat flow.

What does that actually mean?

Windows and doors are rated for their ability to be energy efficient and provide insulation. R-value is a straight calculation of the ability of your window or door to provide reduced heat loss. The calculation for windows also involves the use of caulking and insulation around the window, where it meets the walls. The calculation for doors includes caulking, weatherstripping, the windows (if there are any) in the door, and the material of the door itself.

Different types of materials and glazings or coatings will have an impact on the R-value.

Highest R-Value Windows

If you are looking for the highest R-value windows to provide improved energy efficiency for your home, then we can help. At Bavarian Windows, we offer energy-efficient windows in a range of brands and styles. Many of our products are also Energy Star-certified, which means they achieve certain benchmark standards. ‘

Request a quote for high R-Value windows today and we’ll get in touch! 

What is U-Value?

The formal definition of U-value is ‘a measure of the heat transmission through a building component (e.g. window or door) or a given thickness of a material (as insulation).’ The lower the number, the better the insulating properties.

What does that actually mean?

Windows and doors are rated for their ability to be energy efficient and their ability to conduct heat. The calculation for windows and doors takes into account the same elements of caulking, weatherstripping, window panes, and the material of the door or window itself.

You want your windows and doors to keep the heat in during the winter and out during the summer — and you don’t want them to act as efficient conductors transferring in the heat or cold.

Ultimately, you want to purchase a window or a door with a high R-value and a low U-value. And, if you know the U-value of your window, then you can easily calculate the R-value (1/u-value=r-value).

Cardinal Glass

Bavarian Window Works is proud to use Cardinal Glass. Cardinal manufactures high-quality glass for residential use featuring a range of insulating glass and coated glass. Their innovative coatings, specialized spacers between the glass, and protective films offer some of the industry’s highest insulated and lowest conduction windows.

We know there’s a lot to consider and we want you to feel comfortable with your choices. Come and visit the Bavarian Window Works showroom today to learn more about all our great options. We will help you figure out what will work best in your home.


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