Leo Rainer is an engineer in the Building Technology and Urban Systems Division of the Energy Technologies Area at Lawrence Berkeley National Laboratory. He has more than 30 years of experience in building energy efficiency including work on building simulation, monitoring, miscellaneous energy use, and building codes and standards. Mr. Rainer is currently responsible for the development and maintenance of the Home Energy Saver website. Mr. Rainer earned his B.S. in Mechanical Engineering from the University of California at Davis in 1981.
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.
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.
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.