Low-E glass helps keep your home cool in the summer and warm in the winter.

Low-E (low-emissivity) glass is coated with a low-emittance material designed to reflect heat. A window made with Low-E glass repels ultraviolet rays that generate heat during the summer but absorbs UV rays and lets heat in during winter. The better insulated the window glass, the more comfortable your room temperature.

Low-E 180

With a glass U-Factor of just 0.26 and an SHGC of 0.69, Low-E 180 Glass is an excellent basic product for passive solar applications. By blocking heat loss to the outside of the glass, the high solar gain glass keeps homes warm in winter and cool in summer.

Low-E 272

 Low-E 272 Glass delivers year-round comfort, reflecting an intermediate level of heat back into the room in winter and rejecting the sun’s heat and UV rays in summer. This product’s patented coating provides clarity and high-performance low-solar control, reducing window heat gain by 50% compared to ordinary glass.

Low-E 366

The ultimate performance glass, Low-E 366 provides the highest levels of year-round comfort and greatest energy savings. Its patented coating offers an ideal balance of solar control and high visibility. Blocking up to 95% of the sun’s damaging rays, Low-E 366 glass sets a new standard in energy performance.

FAQ Friday is a weekly feature where we answer Frequently Asked Questions about our products, service or industry. To see other FAQs we’ve answered, visit our FAQ page. If you have a question you don’t see an answer for, just ask in a comment or contact us.


  1. Robert Mason

    Is your Low-E 366 tempered glass considered hurricane glass?
    Thanks in advance for the help.

  2. JELD-WEN Canada

    Hi Mr. Mason, our Low-E 366 tempered glass is not hurricane glass. Low-E 366 is a type of Low-E coating to help control solar heat gain.

  3. Milorad Ducic

    How much is i89 improved e 366 glass?

  4. Thank you for explaining the difference between these types of Low-E windows! Many homeowners are unfamiliar even with the term itself, so in case anyone here wants to learn more about these windows, like how it’s affecting HVAC systems or window designs, there’s a guide here just for you: https://portella.com/blog/what-is-low-e-glass/

  5. Emma sivewright

    The differences between low-e-180 and 366 glass are easily seen. Low-e-180 glass is made with lower levels of toxins and has a more transparent appearance. It can also be used for a wider range of applications, such as windows, mirrors, and glass products.
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