---
title: "What Is Low-E coating? Window and Door Glossary"
description: "A low-E coating is a thin, nearly invisible metal layer on glass that reflects heat while letting daylight through."
url: https://honeyrock.multisites.ai/glossary/low-e-coating
publisher: Honey Rock Window and Door
phone: +1-214-484-9982
quote: https://honeyrock.multisites.ai/contact-us
---

# Low-E coating

A low-E coating is a thin, nearly invisible metal layer on glass that reflects heat while letting daylight through.

Low-E means low emissivity. The coating sits on one surface inside an insulated glass unit. It bounces heat back toward its source. In summer it keeps solar heat out. In winter it helps keep warmth in. The glass still looks clear.

Makers offer different coatings for different climates. In Texas you usually want one tuned to cut solar heat, which shows up as a lower [SHGC](https://honeyrock.multisites.ai/glossary/shgc). The coating works best inside a sealed [IGU](https://honeyrock.multisites.ai/glossary/igu). Our [glass options guide](https://honeyrock.multisites.ai/guides/glass-options-for-windows-and-doors) compares the choices. Ask your dealer which coating suits each wall of your house.

[Where it mattersEnergy-efficient windows for Texas](https://honeyrock.multisites.ai/energy-efficient-windows-texas)

## Related terms

-   [SHGC (Solar Heat Gain Coefficient)](https://honeyrock.multisites.ai/glossary/shgc)
-   [IGU (Insulated Glass Unit)](https://honeyrock.multisites.ai/glossary/igu)
-   [U-factor](https://honeyrock.multisites.ai/glossary/u-factor)
-   [Visible transmittance (VT)](https://honeyrock.multisites.ai/glossary/visible-transmittance)

## Sources

1.  [US Department of Energy (FEMP): Purchasing Energy-Efficient Residential Windows, Doors, and Skylights](https://www.energy.gov/cmei/femp/purchasing-energy-efficient-residential-windows-doors-and-skylights)

![A modern home with wide glass doors lit warm at dusk beside a pool](https://honeyrock.multisites.ai/_astro/dusk-modern-home-pool-01.CeePxgPr_Z2giQin.webp)

## Let’s frame your view.

Send your plans or a few photos of the openings. We will help you choose the system, the brand and the glass.

[Start your project](https://honeyrock.multisites.ai/contact-us)[or call (214) 484-9982](tel:+1-214-484-9982)