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I already commented on that:

I'm not sure if I understand your opinion now. Are you for or against controlled residential ventilation? Or do you actually see a need for controlled residential ventilation in new buildings?

I am a self-proclaimed analog ventilation enthusiast and by no means against controlled residential ventilation itself, but only against the naivety of thinking that it is the silver bullet. From air conditioning systems, one knows what kind of microbial reservoirs they can become. In controlled residential ventilation, the filters may be absolutely finer, but in relation to the duct cross-section the particles that pass through are even larger. Every branch and every connection creates a shear edge where particles swirl and accumulate. Therefore, I am convinced that air purity in a controlled residential ventilation house is significantly more allergy-friendly in the first five years than with "old-fashioned" manual ventilation, but this reverses over time and so especially sensitive people initially breathe a sigh of relief with controlled residential ventilation, then wonder about a diminishing effect after a few years, and in the long run do themselves a disservice. Until then, there may be corresponding innovations in cleaning technology - but who guarantees that?

I would build my own house today with controlled residential ventilation - but I am also not the type who “builds for life” - I sometimes have the impression that, with the exception of , the typical German homeowner rejects the idea of the "property ladder."

I have the opposite feeling. Now everyone is installing it because it is somehow fashionable. As you can see, two opinions

Do you say that about your chosen heating system as well? Because you can also heat with wood or coal. It is not a fashion, it is new technology. If you don't use it because the five-figure amount is too expensive, you don't have to come up with "fashion"

Do you say that also about your chosen heating system? Because heating can also be done with wood or coal.
It is not a trend, it is new technology. If you don’t use it because the five-figure amount is too expensive, you don’t have to come up with “trend”

There is a big difference between controlled residential ventilation and better heating. Ground-source heat pumps are considerably more efficient than air-to-water heat pumps and I save monthly ancillary costs. You can also mention the argument of a better sense of environmental protection. Controlled residential ventilation is hardly operated by air and consumes electricity. It is simply a replacement for shock ventilation (yes, with heat recovery).

I will consider it, but in my eyes it is not a must without which my house would become much worse.

Heating has nothing to do with [Kontrollierte-Wohnraumlüftung]. [Kontrollierte-Wohnraumlüftung] is actually a must in airtight houses. You can only achieve air exchange if you fully open all windows several times a day. If both are employed, that is often not possible. We have n=0.5 and [Kontrollierte-Wohnraumlüftung] is a must with these values.

I offer 1075€ net per kWp (for a 9.9 unit), outsourced.

Hello Andre

Unfortunately, I cannot send a private message.

We would also appreciate a tip

Our offers are unfortunately also more in the price range of 1500€ per kWp