Geothermal heat pump single-family house 200m² underfloor heating kfw55 - setting/optimization

How do you come to the conclusion that I cool down the thermal envelope by airing out crosswise for 5 minutes? There is merely an air exchange taking place that blows out all the grime that accumulates in the room overnight.

Earlier it was still 10 minutes.

Once again, very briefly: The bedroom is warmed by adjoining rooms. The bedroom is still cold. Possible cause: exterior wall poorly insulated, or ventilation losses. Simple physics.

So basically, I would actually plan for it in the bedroom just as in the living room if people are regularly there. Especially in the bedroom! For us, two people sleep there every day. It doesn’t help me at all to know what the temperature is there after 2 weeks of vacation – it can then also be too cold. I firmly include the entry of 2 persons * 8h/day there. And then it seems to follow that it appears impossible to keep a larger deviation than 2 degrees from the hallway and the bathroom as neighboring rooms UNLESS I regularly open the thermal envelope and ventilate. Then I apparently manage instead of 20-20.5° to have 21.5° in the hallway and 23° in the bathroom, with an average temperature of ~19-20 degrees (in use due to 2 persons * 8h/day). At least I have not heard a counterexample from Alessandro.

I still want to bring up my questions again:

[*]Are the specifications for the produced heat quantity in heat pumps usually standardized and calibrated? Can you believe these or are they (possibly even intentionally) embellished values? Are these values calculated and/or measured?
[*]Does it make sense to heat rooms that should be as cold as possible but border warm rooms anyway? For example, the bedroom? To me, it does not make sense, since the heat input from 2 persons * 8h/day + heat exchange from neighboring rooms is already too high.
[*]Does it make sense to heat rooms that are not used but could serve as storage (e.g., basement rooms), and if so, what temperature/heat input? With the door open, it is hardly possible to keep them under 20 degrees – since other rooms in the basement are occupied. They already benefit from the other rooms without their own heat input. And with the door closed, they have less storage benefit?! Here I would suspect that it could make sense to turn up these rooms a bit and therefore turn down the neighboring rooms a bit to keep the same temperature everywhere and thus increase the storage volume?
[*]According to the calculation of hydraulic balancing, I should only open my bathrooms with 0.9 and 0.7 l/min flow. However, I have both fully open (>2 l/min). The house connection room, on the other hand, has been agreed at 15 degrees (nobody asked me) with 2.2 l (i.e., full flow). In the HAR I set 0.5 l and it still has 21 degrees (since all the technology is also located there). In the bathroom fully open it has 23°, although 24° was “agreed.” The guided liters from bathroom and HAR are not very different. That makes no sense to me unless it is assumed that ERR are installed. But isn’t that exactly the goal of a heating load calculation or hydraulic balancing, that one could do without them? I must say that the heating load calculation and the hydraulic balancing were only done later because we switched to a kfw55 funding/build during construction and the house-building company with its heating installer used this program for the first time and therefore “forgot” it. A third-party company also had to be “bought in” for the calculation and now the heating installer will come soon to adjust the hydraulic balancing. But I am skeptical whether these values are in any way reasonable.

1. At least with Stiebel Eltron, this is not very precise / tends to be optimistic. I guess it is no different with others.

4. You ignore the laying distances. 2l/min sent through 10m distance and 1l/min sent through 100m pipe. Where is more heat energy transferred? (With corresponding Delta T)

Are the specifications for the produced amount of heat in heat pumps usually standardized and calibrated? Can one therefore trust them or are they (possibly even intentionally) embellished values? Are these values calculated and/or measured?

The "amount of heat" or power can be calculated based on the flow rate and the temperature difference between supply temperature and return temperature.
Deviations arise regarding the water, so depending on additives one would have to correct the value, but I don't think anyone does that.
Whether something extra is added on top, I of course cannot answer!

Does it make sense to heat rooms that should be as cold as possible but adjoin warm rooms anyway? For example the bedroom? - For me it doesn't make sense, since the heat input from 2 persons *8h/d + heat exchange from neighboring rooms is already too high.

What do you mean by sense? Consumption or comfort?
Overall, the heat pump will probably consume less if you heat all rooms.
As always the statement, ERR off, flow everywhere -> low supply temperature, low consumption.
However, the temperature differences become smaller there, which is unpleasant for some (in the bedroom, for example).

Does it make sense to heat rooms that are not used but could serve as storage (e.g. basement rooms), and if yes, at what temperature/heat input? With the door open it is hardly possible to keep these below 20 degrees - since other rooms in the basement are occupied. So they already benefit from the other rooms without their own heat input. And with the door closed they have less storage benefit?! - here I would assume that it could make sense to turn up these rooms a bit and turn down the neighboring rooms to keep the same temperature everywhere and thus increase the storage volume?

Why storage? Here the same answer as above applies.
Of course only useful if the basement is well insulated too!

But isn't exactly this the goal of a heat load calculation or a hydraulic balancing, so that one could do without this?

Yes.
The calculation sounds a bit odd at first, but one would have to look at it in detail to assess it more precisely.