Building Energy Codes: Insulation (image) DOE/Pacific Northwest National Laboratory Caption Building energy codes -- which regulate factors such as building insulation pictured here -- could play a major role in reducing China's building energy consumption, according to a study led by the Department of Energy's Pacific Northwest National Laboratory. Credit PNNL Usage Restrictions Credit PNNL. 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.