He's goal is to find the optimal intersection of esthetical, economical and technical aspects in architecture. Important for him is the holistic view to sustainable architecture design. An interdisciplinary approach to sustainable architecture is important to put the building design in a greater context. This includes an analysis of all energy consumers in a building like heating, cooling, warm water heating, ventilation and artificial lighting. The research interest is focused on ways to find an optimal solution for "passive" and "active" building design strategies considering ecological, economical and technical aspects. This includes an analysis of the applicability of sustainable building certification methods like Passivhaus, Minergy and ENEV in different climate zones. A confrontation of initial economic and ecological efforts to the needs at building operation is essential to find appropriate assessment methods in all climates.