---
title: "What Is SHGC (Solar Heat Gain Coefficient)? Window and Door Glossary"
description: "SHGC is a number from 0 to 1 that shows how much of the sun's heat passes through a window. A lower number blocks more heat."
url: https://honeyrock.multisites.ai/glossary/shgc
publisher: Honey Rock Window and Door
phone: +1-214-484-9982
quote: https://honeyrock.multisites.ai/contact-us
---

# SHGC (Solar Heat Gain Coefficient)

SHGC is a number from 0 to 1 that shows how much of the sun's heat passes through a window. A lower number blocks more heat.

SHGC stands for solar heat gain coefficient. It measures the share of solar heat that gets through the glass and into your room. Zero means no heat gets through. One means all of it does. Low-E coatings and tints are the main ways makers change it.

In North Texas, summer sun drives cooling bills, so a low SHGC matters most on south and west walls. A low number can also darken the glass if the maker is careless, so check [visible transmittance](https://honeyrock.multisites.ai/glossary/visible-transmittance) next to it. Both numbers sit on the [NFRC label](https://honeyrock.multisites.ai/glossary/nfrc-label). See how we pair them in our [energy-efficient windows for Texas](https://honeyrock.multisites.ai/energy-efficient-windows-texas) guide. Ask for the rated figure for the exact glass you will receive.

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

## Related terms

-   [U-factor](https://honeyrock.multisites.ai/glossary/u-factor)
-   [Low-E coating](https://honeyrock.multisites.ai/glossary/low-e-coating)
-   [Visible transmittance (VT)](https://honeyrock.multisites.ai/glossary/visible-transmittance)
-   [NFRC label](https://honeyrock.multisites.ai/glossary/nfrc-label)

## 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)