Advice 2: Profile width

Profile width, e.g. 52mm, 60 mm, 78 mm means how deep does the profile gets into the walls, defines things like ability to install a wider glazing unit or other additions - special inserts that impact the Uw of the window.

Windows with a wider profile will have thicker frames, more chambers, will also be much heavier and - in dependence of other available configurations - e.g. warmer.