Retrofitting air conditioning in the Strenger Baustolz house

Two years ago, we purchased a terraced house type "Jazz" in the residential complex of the company Strenger Baustolz. We want to install an air conditioning system to cool the expanded attic and the bedrooms on the first floor. Due to the serial construction method (concrete walls with cable ducts) and the ETICS, retrofitting seems to us to be associated with a high effort. Is there anyone in this forum who has retrofitted an air conditioning system in a Strenger Baustolz house? We would be very grateful for technical advice on implementation. The Deutsche Reihenhaus has a similar serial construction concept. Experiences here might be transferable.

Due to the serial construction (concrete walls with cable ducts) and the ETICS, retrofitting seems to us to be associated with high effort.

No, the effort is identical to most new builds. You do have a serially prefabricated house, but the retrofitting is similar to a "normal" house that was built with masonry and has an ETICS.

No, the effort is the same as for most new builds. You do have a serial prefabricated house, but the retrofit is similar to a "normal" house that was built with bricks and has an ETICS.

This answer leaves me somewhat puzzled. A 12 cm concrete wall with reinforcement means that, unlike a brick wall, I shouldn't chase grooves to lay new electrical wiring. Therefore, I would have been interested in a concrete piece of advice from a proud Strenger house resident. Split solution? Multiple indoor units? Where do I tap the power? Core drilling or via the register shaft? Or installation on the roof?

This answer leaves me somewhat puzzled. A 12 cm concrete wall with reinforcement means that, unlike a masonry wall, I should not chase it to install new electrical wiring. Therefore, I would have been interested in a concrete piece of advice from a proud strict homeowner. Split solution? Multiple indoor units? Where do I tap the power from? Core drilling or via the riser shaft? Or installation on the roof?

It all depends. How many rooms should be cooled? Where are the electrical lines located?