What's the Deal with Low-E Glass?

What is low-e glass and why does it matter?

summer winter lowe glass diagram
summer winter lowe glass diagram

When it comes to windows, the type of glass is critical. Experts estimate that 70% of energy loss occurs through windows and doors, with 90% of that loss occurring through the glass!

Low-E, or low-emissivity, glass is created by applying a microscopically thin, transparent coating that reflects exterior heat outward and reflects interior temperatures inward. It minimizes the amount of infrared and ultraviolet light that comes through the glass yet allows plenty of natural light to pass through.

Low-E glass has been the standard for many years (now required by code in Texas). If you have your original aluminum framed windows, chances are you do not have low-e glass. You can confirm by looking for the signature greenish or bluish tint on low-e glass from the outside, but rest assured it is invisible looking outward.

Every window we offer includes this low-e technology and is certain to improve inside comfort and, assuming all is constant, will result in lower utility expenses.

About Cardinal LoE3-366 Glass

For years, Cardinal has been setting the standard for energy efficient glass. Top-of-the-line residential window and door manufacturers all rely on our high quality. Our patented state-of-the-art sputter coating processes are unmatched by any other glass manufacturer. Now we’ve raised the bar. Loå³-366 adds a third layer of silver coating. Result: a clear coating that blocks even more solar gain, reflects heat, and lets the light stream in. Loå³- 366 actually outperforms the tinted glass often used in warm climates.

glass performance chart
glass performance chart
inside and outside glass temperatures
inside and outside glass temperatures