What are the units that measure heating area in Shenyang?

Shenyang Tianrun Thermal Heating Co., Ltd., Shenyang Lantian Wisdom Gas Heating Co., Ltd., etc. According to the introduction of Shenyang Municipal Government, the units that measure the heating area in Shenyang are Shenyang Tianrun Thermal Heating Co., Ltd. and Shenyang Lantian Wisdom Gas Heating Co., Ltd. ... Shenyang, which was called Shengjing and Fengtian in ancient times, is a prefecture-level city, provincial capital, sub-provincial city, mega-city and core city of Shenyang metropolitan area under the jurisdiction of Liaoning Province, and a central city of Northeast China determined by the State Council.