A man stands in front of the outdoor units 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)