Energy loss through windows (IMAGE) DOE/Pacific Northwest National Laboratory Caption Thin triple-pane windows greatly reduced the power usage by the air-conditioning system in the hottest part of the day, compared with standard double-pane windows. The direct comparison was made in identical custom Lab Homes on the PNNL campus in summer 2020. Credit (Graphic by Katherine Cort | 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.