Application as a building envelope. (IMAGE) The Hong Kong Polytechnic University Caption (A) Photograph of the model houses, with the white cooling ceramic and white commercial tile applied on the roof (area: ~1.15 m2). The model houses were installed 2 m apart during the experiment to eliminate interference. (B) Differences in the roof and indoor air temperatures for the two model houses. (C) Electricity usage of the two model houses with air-conditioning set points of 25°, 23°, and 20°C. (D) Energy-saving performance on a worldwide scale considering the energy consumed by cooling systems, fans, and heating equipment. Credit © 2024 Research and Innovation Office, The Hong Kong Polytechnic University. All Rights Reserved. Usage Restrictions Nil License Original content 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.