Quiet decentralized ventilation for new single-family house

We have 10 devices and are scratching at an air exchange rate of 0.5 on level 3, assuming that the new building itself contributes 0.2. However, level 3 is too loud for continuous operation and 0.5 is not really necessary (?!). Due to lack of experience, we are therefore curious how living with these things in the house will be.
Costs for 10 are about the costs for your 8 inverters.

BluMartin will probably be one of the quietest systems - however, as a purely decentralized system without secondary air ducts, it is very expensive.

That is - as always - relative; the BluMartin also does not cost more than what you are paying now. Unless you have more than 150 sqm to ventilate. And you would have "only" one wall opening per floor Rheinische greetings

Good, we are planning, I think, the classic single-family house with about 140-150 m²; the decentralized systems seem to be priced identically. Only the usefulness of each system is questionable. That is why we have not yet decided on which system.

One of our builders thinks nothing of the system; on the one hand, he says we insulate, and on the other hand, we make holes in the walls again.

We once listened to a lecture on this, and it was recommended to ventilate every 2-3 hours. (If no ventilation system is present)
No one can afford that anymore today (we certainly can't).

Therefore, the egg-laying wool-milk-sow, few wall penetrations, quiet, and last but not least effective. Does that exist?

Regards

: Decentralized ventilation system. : The plan we received from BluMartin included 4 or optionally 5 units. However, we also have 190 sqm. Additionally, the ducting would have gone into the secondary rooms.

Hello,

: the planning we received from BluMartin had 4 or optionally 5 units. However, we also have 190 sqm. The pipe routing into the secondary rooms would then have been added.

Ok. then it would have cost you about EUR 3.5k more. But the system is really great; we only sell it in the decentralized segment now

Rhenish greetings

I am currently considering having this planned. What will it approximately cost for 140m2 on 2 floors?