CHYY Development Group Ltd. is an investment holding company, which engages in the research, development, and promotion of geothermal energy. It operates through the following 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 installation and maintenance of shallow geothermal energy utilization system. The Air Conditioning/Shallow Geothermal Heat Pump segment focuses on trading of air conditioning/shallow geothermal heat pump products. The Property Investment and Development segment refers to the investments in properties for their potential rental income. The Securities Investment and Trading segment consists of trading of securities and other types of investment. The company was founded on December 14, 1999 and is headquartered in Hong Kong.