His research work is focused on developing and optimization of high performance buildings with a comprehensive view to all aspects of the building thermal behavior including passive and active strategies. His research work is aimed to find holistic optimal solutions for the challenges of buildings in different climate zones. Current research work is focused on the uncertainty analysis of building optimization algorithm and on fast calculating building optimization algorithm. The interdisciplinary research work includes aspects of economics, decision theory, statistics, design optimization and building physics. Further research work includes building automation technology and its potential in reducing cost and green house gas emissions. Questions of improved occupant comfort, new ventilation strategies and easy to install technology are prioritized in this research.