How to assess the thermal performance of windows

The Energy Performance of Buildings Directive requires EU Member States to set minimum performance requirements for building elements that are replaced.

Unfortunately, for transparent elements like windows, national requirements too often focus on insulation while other aspects are equally important, like solar gains, cooling though natural ventilation, natural light etc...

Watch this animation to understand the issue and how to solve it by applying the ‘the energy balance’ that combines all relevant thermal characteristics of a window:

To understand the ‘energy balance’ of windows more into details, learn about mathematical formulas and how aluminium helps optimizing them, please look at our infographics