Taisei Oncho Co Ltd is a Japan-based company mainly engaged in the equipment construction business. It operates through four regional segments including Japan, the United States, China, and Australia. The equipment construction business designs and constructs heating and cooling, water supply and drainage sanitation, electricity, constant temperature and humidity, dehumidification, heat exchange, and refrigeration and freezing. The construction business designs and constructs buildings and ancillary facilities. The real estate business rents out land and buildings for commercial and residential use. The other businesses include the sale of heating and cooling equipment, solar power generation, and others.