A villager demonstrates a mobile app, with which users can adjust the water temperature of an air-source heat pump heating system, in Yuanyi Village of Tongxin County, Wuzhong City, northwest China's Ningxia Hui Autonomous Region, Nov. 27, 2025. Located in the arid central region of Ningxia, Tongxin County has enabled 28,000 rural households to switch to clean heating through a rural clean heating renovation program and a supporting "coal-to-electricity" project. (Xinhua/Yang Zhisen)