Window installers (IMAGE) DOE/Pacific Northwest National Laboratory Caption Installers insert thin triple-pane windows at a PNNL Lab Home, custom model homes on the PNNL campus built to conduct energy efficiency research. Credit Photo by Andrea Starr | Pacific Northwest National Laboratory Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.