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What Does a New Window’s Low E Rating Mean?

If you’re looking to buy a new window then you’ve likely seen references to Low E glass. This type of glass has actually been around for more than twenty years, and has improved significantly in that time. However, it’s important to remember that just because glass is referred to as Low E, that doesn’t mean it’ll have the right level of UV protection for your needs.

There’s double Low E Glass, which has two silver layers, and offers better UV protection compared to just a single layer. Then there’s triple Low E glass, which gives you three layers of UV protection.

With these stats in mind, some homeowners may wonder why a customer wouldn’t just always buy a window with the highest Low E rating and the most layers. The reality is pretty simple: In most cases, the fewer the layers, the lower the price is. Keep in mind that these lower rated windows may not offer you the UV rating you’d like and they may also make your windows ineligible for energy rebates.

It’s important for you, as a homeowner, to know that a window with a Low E Glass rating isn’t “just as good” as one with a double or triple layer of protection – no matter what the company you’re working with may tell you.

How to get the right level of protection

First of all, make sure that the sales representative you’re working with knows what percentage of UV rays you want blocked. This info isn’t always available on the Energy Star label that comes on new windows, but experienced window sellers should be able to tell you.

For example, some windows can block up to 95% of UV rays, while others may only block up to 42%. Depending on the specific location of the window you want to replace, 42% may be enough for you. As mentioned before, it’s likely to be less expensive but one thing’s for sure: You need all the information to make the most informed decision.

If you have questions about glass ratings, whether for windows or glass doors, Charles Window is here to help. Give us a call or stop by our award-winning showroom to see our high quality options for yourself. If you’d prefer, we can also come to you for a no-pressure, no-cost in-home consultation. We are here to provide you all the knowledge you need to make the right choice for your home.