I've almost always seen indoor blinds, which are useless in keeping heat outside the windows. In Southern Europe blinds are outdoor and keep solar radiation outside the glass, and there are separate curtains inside for privacy when the blinds are open.

Compare Antwerpen[0] or Brussels[1] with Milan[2] or Crete[3] or Barcelona[4]

[0] https://www.google.com/maps/@51.219842,4.4006387,3a,75y,64.8...

[1] https://www.google.com/maps/@50.8398344,4.3562283,3a,75y,90....

[2] https://www.google.com/maps/@45.4558029,9.1837501,3a,75y,29....

[3] https://www.google.com/maps/@35.3266049,25.1255372,3a,75y,34...

[4] https://www.google.com/maps/@41.3880801,2.1358851,3a,75y,256...