New windows for a house from 1993 - brand and installation

Hello everyone,

I want to replace the windows of my house and install triple-glazed windows. I have offers for the following windows:
a) Rehau Synego 80mm AD
b) Salamander Bluevolution 82mm MD
c) ALUPLAST Ideal 8000 85mm MD

One window manufacturer advertised with V-Perfect technology (Aluplast windows). Is this state of the art and the others just didn’t mention it, or is it really something special?
From my perspective, all windows sound quite similar, but maybe someone knows particular advantages or disadvantages of the models. All the windows have profiles with a recycled content of over 55%. Therefore, they are subsidized by our municipality.

From what I have read here and elsewhere so far, installation apparently is even more important than the window itself. Each provider has written something different regarding this, so I am uncertain which installation method is correct. Our windows all have roller shutters, and the house exterior is insulated with 6cm thermal insulation and plastered.
One provider offered to seal the windows on the outside, but that seems wrong to me. Most offered compressible tape on the outside, sealing and lining on the inside, and foam filling. If I understood everything correctly here, that would also be the right installation method, right? The compressible tape should then be applied on the sides and top, correct? How must the sealing of the interior side be done? And are exterior trim strips useful? These were partly offered as optional.
One window manufacturer advertised production according to RAL, but nothing about RAL was mentioned regarding installation.
I will definitely ask all providers again whether the installation is done by their own staff or by subcontractors.

Thanks in advance for your support!
Thomas

The outside of the house is insulated with 6cm thermal insulation

Could it be that your windows have a better U-value than the wall?
And could it be that this is totally unhealthy for your house?
Isn't the wall insulated first and then new windows are installed?
Doesn't there have to be a concept behind it, otherwise mold threatens?

The replacement of the windows takes place in coordination with my energy consultant and a corresponding ventilation concept has also been developed, so I hope that everything fits...

Could it be that then your window's U-value is better than the wall's?
And could it be totally unhealthy for your house?
Don't you insulate the walls first and then get new windows?
Doesn't there have to be a concept behind it, otherwise mold threatens?

I just had the same thought. But even 60mm EPS WLG 040 comes to a U-value of 0.6.

That corresponds to very good triple glazing, but the profile doesn't come close. That means the coldest component remains the profile and possibly the glass. If it condenses, then there and not on the wall.

Could it be that your window's U-value is better than the wall's?
And could it then be that this is totally unhealthy for your house?
Don't you insulate the walls first and then get new windows?
Isn't there supposed to be a concept behind it, otherwise mold threatens?

Please finally stop blaming new windows in old buildings for mold. That is not true. Incorrect ventilation and heating behavior cause mold. Nothing else.

Please stop blaming new windows in old buildings for mold. That is not true. Incorrect ventilation and heating behavior are to blame when mold develops. Nothing else.

What’s wrong with you? There are 4! question marks in my post. I hardly know anything about it (as you can read), yet you have to just throw the idea in when the OP simply mentions replacing windows - after all, the ventilation behavior of an old window is different from that of new windows - And the OP has already clarified, so all good!