CHYY Development Group Limited, an investment holding company, engages in the research and development of geothermal energy as alternative energy for building heating applications in Mainland China. The company operates through four segments: Shallow Geothermal Energy, Air Conditioning/Shallow Geothermal Heat Pump, Property Investment and Development, and Securities Investment and Trading. The Shallow Geothermal Energy segment is involved in the provision, installation, and maintenance of shallow geothermal energy utilization systems. The Air Conditioning/Shallow Geothermal Heat Pump segment trades in air conditioning/shallow geothermal heat pump products. The Property Investment and Development segment invests in properties. The Securities Investment and Trading segment engages in trading securities and other types of investments. It also provides property development and management, and technical support services; and installs energy systems. The company was formerly known as China Geothermal Industry Development Group Limited and changed its name to CHYY Development Group Limited in August 2022. CHYY Development Group Limited was incorporated in 1999 and is headquartered in Central, Hong Kong.

HKSE:8128