Heat pump in connection with house air conditioning

Usually 22 in the morning (sometimes even less) and around 23.5 in the evening. On the upper floor usually 1 degree more. Mostly shaded and passive cooling activated via underfloor heating. (KfW60 timber frame hut)

Cool, so that means the passive cooling brings you almost 1-2 degrees?

No offense (I don’t know the details of the project). But what I don’t understand: For such a large-scale project, apparently financially solidly backed – why then put so many additional costs into air conditioning (=treating the symptoms) instead of going higher in the energy efficiency standard and also ensuring sufficient shading/planting and trees/less stone outside? One doesn’t exclude the other, and air conditioning is still possible. But my levers would be prioritized differently. Have you really exhausted everything in this regard?

Cool, so passive cooling brings you almost 1-2 degrees?

Probably more like a good 3. It has been running around the clock for over 3 weeks now. At the beginning at 20... then 19 and for over a week now at 18 degrees flow temperature.
In the bathroom, I reduced the flow by 50%, the rest remains unchanged.
This function is worthwhile again this year. That was already standard at the provider back then.

why then put so many additional costs into air conditioning (=treating symptoms) instead of raising the energy efficiency standard even higher and also ensuring sufficient shading / planting and trees / little stone outside

Eventually, even the best KFW-something building reaches its limit when it comes to keeping heat out. But a capable architect does indeed think about shading and optimal architecture.

No offense (I don't know the details of the project). But what I don't understand: For a project that is so large in scale and apparently financially well-backed – why then invest so much in additional costs for air conditioning (=treating symptoms), instead of raising the energy efficiency standard even higher and also ensuring sufficient exterior shading / planting and trees / little stone? One does not exclude the other, and air conditioning is still possible. But my priorities would lie elsewhere. Have you really exhausted all possibilities in this regard?

Your line of thought makes absolute sense to me. Certainly, I have not yet exhausted everything when it comes to external factors for air conditioning. However, I also agree with driver55's comment. I don't think a great KfW standard guarantees cooling. With weeks of temperatures over 30 degrees, presumably every shading and insulation will reach its limits. To me, "a few degrees below outside temperature" is not reliable enough. Especially since cooling with a heat pump simply has physical limits. With an air conditioner, I can go as low as I want (though not as sustainably).

Of course, my goal remains to only turn on the air conditioning when necessary and to assist with other methods like shading.

Unfortunately, I am a branded child when it comes to house climatization, and now that I can create the infrastructure relatively inexpensively, I don't want to miss the opportunity.

Eventually, the best KfW-something building is done with keeping heat outside. But a capable architect really thinks about shading and optimal architecture.

Probably more like a good 3. It has been running around the clock for over 3 weeks. At first with 20… then 19 and for over a week at 18 degrees flow temperature.
In the bathroom, I reduced the flow rate by 50%, the rest unchanged.
This year the function is worthwhile again. That was already standard with the provider back then.

Do you have a basement? I'm a bit worried about shifting the dew point there with the cooling or condensate forming that then, for example, runs into the insulation / screed... without a basement, I would do it immediately…