is by the way a she.
Otherwise, it really is a double-edged sword. Or in other words: Blessed are the simple-minded, for they will always have a functioning ventilation/heating/photovoltaic system with storage.
If you work yourself into it, you might be able to get the last 20% more efficiency/performance/silence out of it, but it also costs four times as much effort.
The problem is, most heating installers follow a standard procedure. Heating has to heat, ventilation has to ventilate and they often overdimension or play it safe so as not to have too much effort beforehand and afterwards.
Heat pumps are oversized, flow temperatures planned too high, ventilation designed for too large volume flow etc.
There’s definitely room for improvement. But note: craftsmen are often a proud bunch. My first HSLer, the standard subcontractor of my general contractor, terminated the collaboration because I asked too many questions.
My current one is much better, but it cost me a lot of sweat to get him and he isn’t perfect either. And the whole trade doesn’t get any cheaper because of it.
What you can definitely do, however, is at least communicate that low noise level is important to you and think about which standard temperatures you want in which rooms.
Otherwise, it will be designed strictly according to DIN: 20°C in living rooms, 24° in bathrooms.
If you want 22° in living rooms, depending on the design, it can get tight or the consumption will increase accordingly.