In the applied optics and functional surfaces business area, various kinds of coatings for improving thermal insulation in both winter and summer are an important topic. Vacuum glazing systems are one possible way of additionally minimizing heat transfer in windows.

Optically switchable window systems , for example with electrochromic, gas-chromic or thermotropic glasses make it possible to adjust windows and façades dynamically to varying environmental conditions and user requirements.

Further detailed information about windows and façades may be found under the Area of business Energy-efficient buildings