Basic ventilation system

Hello,

since my roof has been modernized and now basically everything is very tight, I am considering installing a ventilation system for the attic apartment. Especially since I am sometimes away for 1-2 weeks and tilted windows are not always rainproof. But I lack basic information about this.

My ideas.
Forced ventilation of the rooms when the humidity is too high, can this be done for individual rooms?
-> Bathroom, insulated attic, office, bedroom, living-dining room including kitchen
-> Can such a system be operated properly if a Swedish stove is installed in one of the rooms of the apartment, or is this a fundamental problem?
-> Can such a system, for example, extract warm air (too warm air) from one room and distribute it to other rooms, i.e., as heating support?
-> Are these air or ventilation noises noticeable or audible?
-> Can such a system be installed in the attic, would there then be too much noise pollution in the bedroom below (the attic is insulated on the roof side, so no insulation towards the rooms below)?
-> Can heating costs be saved with such a system?
-> Does such a system distribute air that becomes too humid in rooms to rooms where the air is measured as too dry, or does it always go outside?
-> Is such a device in continuous operation or only 2, 3,... 6 times a day?
-> Is it controlled by humidity or temperature and humidity?
-> I keep reading that mold in the system would be dangerous. How realistic is it that such a system actually develops mold, what and how often do you have to clean something there?

The apartment is about 95m² with an average ceiling height of 3.2m. So roughly 300m³ volume (unfurnished).
It is divided into
Living room, dining room, kitchen (one large room) 55m²/187m³
Bathroom 10m²/34m³
Bedroom 14m²/28m³
Hallway 10m²/35m³
Office 6m²/12m³

Does it make sense to connect the thermostats of the radiators directly to this system to control temperature and humidity in the apartment from one central location?
Would that be called a basic package or already a premium standard?

For my bathroom I have already procured an exhaust pipe including a fan. The exhaust pipe has a diameter of 100mm. Could this be used as an exhaust pipe so that I don’t need to make another breakthrough through a wall?

What are the basics that such a system must fulfill and what is a bonus? The connection with the heating will probably be a bonus, so it will also involve more costs.

Can an estimate be made of what such a system will cost for an apartment?

So actually installs decentralized ventilation systems in existing buildings. Just google it, then all your questions can be answered very quickly.

These are pipes that blow air into the room and others that suck it out. Of course, you can come up with a control concept and have it implemented... but will it ever work the way you imagine? I doubt it. Connecting the rooms to each other is also rather unusual.

In the existing building, you would have to work with duct enclosures or suspended ceilings... or just decentralize... When it comes to substance protection, such a simply decentralized system is actually wonderful... it always runs on 1 and when you leave, you can set it to 2.

In principle, I have a few key points that I would like to have fulfilled with such a system.
- Forced ventilation at too high humidity (not only affecting the bathroom)
- Extracting the excess heat, for example from the wood-burning stove, which accumulates at the ceiling, and blowing it out, for example, in the bedroom, hallway, office.
- Fresh air supply

The main thing, however, is that the moisture goes out. The roof was renovated to KW50 standard and I only have a few square meters of gable wall on the exterior. Otherwise, there are no more old exterior walls in the attic apartment, or there were no further exterior walls.
So the entire apartment is somewhere between KW50 and KW70.

For me, distributing excess heat, especially with a ceiling height of 3m+, also seems like a useful heating support.

I don’t know offhand how many pipes I would have to lay there. I suppose it also depends on where it makes sense to extract the warm air and redistribute it. Since there is still an attic in some parts, I could imagine that this won’t be too dramatic in my case. At least hiding the pipes.
If it worked out quite well, I would only have to cut a few holes for ventilation in the room walls and could lay and hide all the pipes in the attic. However, I don’t know if it will work as I imagine it spontaneously.

Basically, I would then need a device that on the one hand can draw fresh air from outside and distribute it in the apartment, or extract room air and either send it outside or, if necessary, direct it into another room.

No idea how high the effort for something like that is, whether it is standard or a special build. But I do find it interesting to regulate an apartment like this.

It would also be interesting to be able to tell the radiators that they no longer need to heat or need to heat less because warm air is being added from another room.

Heating thermostats with temperature sensors? Where is the problem? But as I said, I will first read up on the topic fundamentally

yes, sure, but can you estimate how much a system like the one I described roughly costs? So warm air distribution to other rooms Fresh air supply Ventilation in case of too high humidity Which professional actually accomplishes something like this? Are these heating engineers or do you go somewhere else in this case?