Question about tesa tesamoll THERMO insulating film for thermal insulation on windows

Less heating from direct rays. The window should be in the shade. But against material transmission, of course. In my opinion by 1-2 degrees at the surface. I've mounted it partially on both sides.

And if it doesn't protect, do you have a recommendation for a film that protects against heat (I've seen another brand on galaxus but some people are complaining...)?