In 1984, Teo Hong Silom Co., Ltd. signed a joint venture agreement with Takasago Thermal Engineering Co., Ltd. of Japan to provide design, installation and maintenance of air conditioning, plumbing and electrical system emphasizing in climate control and environment control for Clean Rooms, Bio Clean Rooms, Thermal Chambers and Dry Rooms.

Thai Takasago with its technical know-how and capability, systematizes and controls every factors related to Air and Heat, such as, cooling, heating, humidity control, drying ,dust eliminating, energy saving, etc. and has greatly contributed to the development of industries and society in every age as a pioneer of Clean Room.