Experiences with a central residential ventilation system

...So far, no one has been able to answer your questions, except that it is state of the art (statement from a solid construction company)!

A controlled residential ventilation system is fundamentally not a mandatory requirement! Its advantages result, among other things, from the respective user behavior as well as the specific boundary conditions. A global statement "pro" or "contra" is absolutely nonsensical.

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Does anyone have experience with how the cleaning of the central controlled residential ventilation takes place and what such a cleaning approximately costs?