About Us +
Researchers in the Building Technology & Urban Systems Division (BTUS) at Lawrence Berkeley National Laboratory develop data and technologies that increase energy efficiency and improve the health, safety and comfort of building occupants, in the United States and worldwide.

We work closely with industry partners, academics and government officials to achieve these goals, and share our research widely
Research +
We are at the forefront of cutting-edge research that redefines building technology and explores all areas of urban systems.

We have been leaders for decades in developing energy-efficient windows, improving indoor air quality, coming up with new ideas to fix the nation's electricity grid, and so much more.

Visit our research areas at the right to find out more.
Colum 1 +
Colum 2 +
Publications +
Enjoy presentations from Building Technology & Urban systems research experts on a wide variety of topics in the areas of building energy efficiency, the electricity grid and how it relates to buildings and much more.
- Presentations
News
Tools & Guides +
Explore our tools, guidebooks and software and download for free.

We offer a variety of technologies designed to simulate and model real-world circumstances to assist in energy-saving programs and help building owners build better buildings. These tools can help calculate performance of building systems like windows and shades, help consumers and builders pick the best windows for a variety of applications and much more.

Windows Video Series

Windows Video Series for Scientists and Inventors

Watch this video series to learn more about energy efficient windows and basic window design. Berkeley Lab researchers hope to engage scientists, entrepreneurs, and inventors, and to inspire the next window technology innovation.

Episode 1: Windows Basics

In episode one of Berkeley Lab's windows training video series, experts explain the basic nomenclature and terminology for windows and window components.

Reference Sheet on Window Terminology

Quick reference sheet on window terminology presented in video

Episode 2: Heat Flow & Solar Radiation

In episode two of Berkeley Lab's windows training video series, experts explain how heat flow and solar radiation affect energy efficiency in windows.

Factors that Affect Energy Efficiency in Windows

Image of factsheet for second video

Episode 3: Windows for Cold Climates

In episode three of Berkeley Lab's windows training video series, experts explain how colder climates affect window design.

Windows for Colder Climates Fact Sheet

Cover of fact sheet for windows for colder climates

Episode 4: Windows for Hot Climates

In episode four of Berkeley Lab's windows training video series, experts explain how warmer climates affect window design.

Windows for Hot Climates Fact Sheet

Cover of fact sheet for Windows for Hot Climates

Episode 5: Window Optics

In episode five of Berkeley Lab's windows training video series, experts explain the optical properties of windows.

Optical Properties of Windows

Cover of fact sheet for Optical Properties of Windows