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.
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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.
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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.

Publications

Publications By Research Area

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2023

Walker, Iain S., Nuria Casquero-Modrego, and Brennan Less."Challenges and Opportunities for Home Decarbonization." (2023).

2022

Casquero-Modrego, Nuria, WR Chan, Brennan Less, and Iain S. Walker."Getting to Scale for Decarbonizing Homes in the US: An Industry Survey."SBE22Delft - Innovations for the Urban Energy Transition: Preparing for the European Renovation Wave (2022). DOI

Walker, Iain S., Brennan Less, David M. Lorenzetti, Michael D. Sohn, and Nuria Casquero-Modrego."Compartmentalization and Ventilation System Impacts on Air and Contaminant Transport for a Multifamily Building."Buildings XV Conference (2022).

Less, Brennan, Nuria Casquero-Modrego, and Iain S. Walker."Home Energy Upgrades as a Pathway to Home Decarbonization in the US: A Literature Review."Energies (2022). DOI

Walker, Iain S., Brennan Less, Nuria Casquero-Modrego, and Leo I. Rainer."The Costs of Home Decarbonization in the US."Proceedings of the 2022 Summer Study on Energy Efficiency in Buildings. (2022).

Walker, Iain S., Brennan Less, and Nuria Casquero-Modrego."Pathways to Home Decarbonization."Proceedings of the 2022 Summer Study on Energy Efficiency in Buildings. (2022).

Walker, Iain S., Brennan Less, David M. Lorenzetti, and Michael D. Sohn."Analysis of Zoned Residential Ventilation Systems."AIVC/ASHRAE IAQ 2020 Conference (2022).

Kolsch, Benedikt, Iain S. Walker, Woody Delp, Bjorn Schiricke, and Bernhard Hoffschmidt."Comparison of Airflow and Acoustic Measurements for Evaluation of Building Air Leakage Paths in a Laboratory Test Apparatus."AIVC/ASHRAE IAQ 2020 Conference (2022).

Walker, Iain S., and Benedikt Kolsch."Reducing Wind Sensitivity for Blower Door Testing."AIVC/ASHRAE IAQ 2020 Conference (2022).

Zhao, Haoran, Iain S. Walker, Michael D. Sohn, and Brennan Less."A Time-Varying Model for Predicting Formaldehyde Emission Rates in Homes." (2022). DOI

Walker, Iain S., Brennan Less, and Nuria Casquero-Modrego."Carbon and Energy Cost Impacts of Electrification of Space Heating with Heat Pumps in the US." (2022). DOI

2021

Walker, Iain S., Brennan Less, David M. Lorenzetti, and Michael D. Sohn."Development of Advanced Smart Ventilation Controls for Residential Applications."Energies (2021). DOI

Walker, Iain S., Paul Francisco, and Eric Werling."Reducing COVID-19 Transmission in Homes."Building Performance (2021).

Less, Brennan, Iain S. Walker, and Nuria Casquero-Modrego."Emerging Pathways to Upgrade the US Housing Stock: A Review of the Home Energy Upgrade Literature." (2021).

Chan, Wanyu R., Brennan Less, and Iain S. Walker."DOE Deep Energy Retrofit Cost Survey." (2021).

Singer, Brett C., Wanyu R. Chan, William W. Delp, Iain S. Walker, and Haoran Zhao."Effective Kitchen Ventilation for Healthy Zero Net Energy Homes with Natural Gas." (2021).

Less, Brennan, Iain S. Walker, Nuria Casquero-Modrego, and Leo I. Rainer."The Cost of Decarbonization and Energy Upgrade Retrofits for US Homes." (2021).

2020

Zhao, Haoran, Wanyu R. Chan, William W. Delp, Hao Tang, Iain S. Walker, and Brett C. Singer."Factors Impacting Range Hood Use in California Houses and Low-Income Apartments."International Journal of Environmental Research and Public Health 17 (2020). DOI

Zhao, Haoran, Wanyu R. Chan, Sebastian Cohn, William W. Delp, Iain S. Walker, and Brett C. Singer."Dataset: Indoor air quality in new and renovated low‐income apartments with mechanical ventilation and natural gas cooking in California." (2020). DOI

Less, Brennan, Iain S. Walker, David M. Lorenzetti, Evan Mills, Vi H. Rapp, Spencer M. Dutton, Michael D. Sohn, Xiwang Li, Jordan D. Clark, and Max H. Sherman."Smart Ventilation for Advanced California Homes." (2020).

Chan, Wanyu R., Yang-Seon Kim, William W. Delp, Iain S. Walker, and Brett C. Singer."Dataset: Indoor air quality in California homes with code-required mechanical ventilation." (2020). DOI

Piette, Mary Ann, Richard C. Diamond, Stephen E. Selkowitz, Stephane de la Rue du Can, Tianzhen Hong, Kaiyu Sun, Paul A. Mathew, Iain S. Walker, Alan K. Meier, Erik Page, Jessica Granderson, Nan Zhou, and Peter Alstone."Chapter 2: Global Opportunities and Challenges in Energy and Environmental Issues in the Buildings Sector."World Scientific Series in Current Energy Issues (2020). DOI

Kolsch, Benedikt, and Iain S. Walker."Improving Air Leakage Prediction of Buildings using the Fan Pressurization Method with the Weighted Line of Organic Correlation." (2020). DOI

Walker, Iain S., and Brennan Less."Measured Moisture Performance of Sealed and Insulated Attics with Permeable Insulation In California Homes."Thermal Performance of the Exterior Envelopes of Buildings XIV (2020).

Zhao, Haoran, Woody Delp, Wanyu R. Chan, Brett C. Singer, and Iain S. Walker."Performance of Microwave Range Hoods Compared to Traditional Range Hoods."Indoor Air Conference (2020).