Keller Technologies Ltd is an architectural design and engineering company focusing on green tech. or energy saving tech. It has strong technical background from Swiss mother company (Keller Technologies AG. Switzerland) Keller Technologies AG. Switzerland is an outgrowth of the Swiss Federal Institute of Technology (ETH) in Zurich. Research projects on building technology and building physics led by Professor Dr. Bruno Keller have successfully solved technical problems for comfortable buildings with low energy consumption around the world. KT is a special building technology company for healthy, comfort buildings with low energy needs and low energy costs.