Old building with new windows: how to create additional ventilation?

Thank you Joe, I just looked at it.

This option is certainly quite good, however I would like to avoid, if possible, making multiple core drillings in the 60cm slate exterior wall. If it cannot be avoided at all, okay. But primarily I am trying to manage this with the windows and ventilation there (additional grilles, for example), provided a manufacturer offers that. I am currently looking into that.

Right, I didn’t consider your exterior walls.. The window rebate ventilation definitely works as basic ventilation. There are also variants that close in strong winds to avoid excessive drafts

Yes, the energy consultant mentioned that as well. On Monday, he will come back with the roofer for the inspection, and then I will talk to him again about the topic.

Hello,

just search for "Soleo Air" by Höhbauer.

We have the Airpur modules in the roller shutter box and are satisfied so far.
The Airpur modules cost between 1100 and 1300 €, depending on whether for roller shutters or blinds.

Greetings from Bavaria.

Thanks for the tip!

Hello, how have you decided now? Fan or window rebate vent? Internal or external insulation? Which brand and model of the window? Would be very interesting. Thank you very much Regards Daniel