Ventilation in new buildings (central vs. decentralized), noise disturbance

Electricity needs to go everywhere, control, core drilling... I am still not quite sure about the doors... our doors are normal, when I turn on the exhaust fan in the bathroom, air already flows through the door gap; I don’t understand why that wouldn’t be enough.

If decentralized, I think I would just put a device in every room... not significantly more expensive in terms of materials.

And what does it help?

Warm supply air can be cooled against cooler exhaust air so that the house warms up less quickly. As soon as it gets cooler at night (than the indoor or desired temperature), the heat exchanger is bypassed and the cool supply air is fed into the house. All this is temperature-controlled, without any action from the (sleeping) occupants, who can sleep instead of opening/closing windows.

Normally, the bypass is generally open in summer...

Or temperature-controlled automatically.

Does this system have to be installed directly where the pipes go through the outside wall to the outside, or can, for example, a pipe also be routed through another room to the outside?

Typically, the supply and exhaust air ducts are quite thick and also contain the silencers. Talk to a planner about this.

Supply and exhaust air ducts should be as short as possible and may also be on a facade... how far apart they have to be is stated in the description of the system, but usually 2 meters. With combined Vallox wall hoods, the supply and exhaust pipes can even go directly next to each other through the outer wall.

Or temperature-controlled automatically.

If the system is controlled somewhat intelligently, the bypass remains permanently open in summer.

Whereas last summer I did the opposite through the heat exchanger (automatically), and cooled the outside air. It's only a little, but it caused the house to warm up more slowly. I had no problems with condensation (the air doesn't get colder than it already is inside, and the system has a drain)

from on the go

If the system is controlled somewhat intelligently, the bypass remains permanently open in summer.

Whereas last summer I did the opposite via the heat exchanger (automatically), and cooled the outside air.

That's exactly what I mean ... heat recovery works in both directions.

Bieber, but you described it nicely from the manufacturers' advertisement.

I know it too, because we have it as well - and I tell you, it hardly brings any benefit. After all, it's not air conditioning.

And silencers are normally not used in the external ducts - only optionally in the exhaust air.

By the way, we have 11.5m of exhaust air duct and 50 cm of fresh air.