Potentially, the first design phases have the biggest influence on the performance of buildings. Fundamental decisions are made during this stage because it is more difficult to introduce new ideas at a later stage of the process. Often, the Central European architectural style is exported to various other climate zones. The result are façades that counteract traditional climate concepts. In the scope of his PhD work Dipl.-Ing. Marcel Bilow develops a tool that explains the relationship between climate zone, façade layout and the technical building concept specifically for the design process.