Technical room next to the bedroom

Leave it be, when a heat pump is running you have a constant hum. You will definitely hear this at night. And turning off a heat pump is not so easy because you need the heat.

I wouldn't do it either.

...
it would be advisable
...

If it is only "advisable," I would leave it as recommended by my previous commentators. If for any reasons unknown to us it cannot be done otherwise, you would have to try to live with the noises that --> might be heard in your bedrooms. There are also people who live near the runways of airports or who have freight trains rumbling by night after night. We ourselves currently still have an oil heating system from 2001 that we could hear in the bedroom (we could also move the bedroom, but for other reasons we do not want to), but we have gotten so used to it that we no longer notice it.

Are the noises of a controlled residential ventilation system (Zehnder Q350 provided) and a heat pump comparable? We would have a similar situation but only with a controlled residential ventilation system (and district heating). Personally, I had noted to provide a limestone wall or something similar here.

Show me. Given the low roof pitch + knee wall, it’s easy for a layperson to get confused with the stairs and the slopes. I’m in favor of placing the children’s room upstairs. For example like this:

Hello Katja,

thank you very much!

The house you designed is not quite our cup of tea in terms of the layout, BUT it brought in some great ideas again!
Of course!
Utility room downstairs. 2 kids' rooms upstairs + storage room. Study on the ground floor.
Then the kids will first get the study on the ground floor as a kids' room, and when they are older, each will get their own room upstairs.

That would be a good option.

I like the drawings, what program is that? I guess not freeware...

Currently messing around with Sweet Home 3D, but that's not so great, especially when it comes to roof slopes.

Thanks again!

Best regards
Specki