Sommer Informatik GmbH from Rosenheim was founded in 1996. The company stands for highly qualified software solutions in the fields of building physics and static calculation of windows, facades and glass. The cooperation with research and industry, including the Institute for Window Technology (ift) Rosenheim, guarantees the high quality standard of the software. "WinIso®" was certified by ift Rosenheim and is currently being successfully used by many national and international customers for demanding projects. It offers the possibility of calculating heat flows, thermal bridges, isotherms and Uf values according to ISO 10077-2: 2017. WinIso® is impressing with the simplest operation of professional functions, for example the highly automated processing of CAD files.