Taisei Oncho Co., Ltd. engages in the installation of air-conditioning and plumbing facilities. It operates through the following segments: Japan, America, China, India, Philippines, and Australia. Its business divisions include: Facility Construction, Real Estate Leasing, and Others. The Facility Construction division offers design and construction related to air conditioner, air humidifier, and refrigerators. The Real Estate Leasing division leases residential and commercial lands. The Others division handles the sales of air-conditioning equipment; and includes solar power business. The company was founded on April 3, 1941 and is headquartered in Tokyo, Japan.