Installing air conditioning --> KFW funding gone?

Are the low-temperature radiators excluded from cooling? If not, don’t they cause the lower limit temperature during cooling to have to be raised, since condensation happens much faster on those things?

Otherwise, I hope you weren’t afraid that I would attack you! I am not angry at anyone who doesn’t have air conditioning. ;-) And I also know that there can be big differences between houses and the way people live. If everything goes really well, you need neither heating nor air conditioning. But that just doesn’t apply on average.

No, they actually are not. They can also cool. However, they must be explicitly turned on at the bodies. And yes, we were informed that in this case you have to make sure that it does not drip.

And no, I did not mean you. But generally :)

However, together, the two systems complement each other very well: The "Dicke Berta" (heating) can draw a substantial amount of thermal energy from the house, for example, 5 kW. At the same time, a small, energy-efficient air conditioner can dehumidify the air, which also works very well across room boundaries.
So the answer is yes. Both.

Does your statement/recommendation also apply when using a central controlled residential ventilation system, which should dehumidify the air anyway?

I would install it right away. Cheaper, cleaner, currently even subsidized. Two friends have recently built, both (against my suggestion) did not install air conditioning (the house is so well insulated!!). One family has been sleeping in the basement for days, the other does not have one and is miserable. (Admittedly, no one has admitted that I was right yet ;-)

Admittedly, I would probably count myself among them as well, since we are currently building KfW55 (timber frame) with controlled residential ventilation but wanted to do without air conditioning. However, for the past few days, I have been seriously considering possibly taking advantage of the situation during the shell construction phase and installing one directly.

Since I have not yet dealt with any details and have no quotes, can a rough statement be made regarding costs and subsidies? The latter is not fixed but depends on the system.
About what amounts would be roughly expected here for a new building?

Thanks in advance!

a central controlled residential ventilation system, which would have to dehumidify the air anyway?

Due to the lack of a dryer and/or active cooling, the controlled residential ventilation system can of course only dehumidify the air in winter. In summer, the system works exactly the opposite way and rather brings even more humid air into the house.

however wanted to do without an air conditioner. For a few days now, I have been seriously considering possibly taking advantage of the opportunity during the shell construction and installing one directly.

Take advantage of the opportunity. Reflect once more and think about it very objectively. If necessary, take a physics book and please abandon your prejudices. Air conditioners would be evil and the ultimate climate killer.

For a few days now, I have seriously been considering taking advantage of the opportunity during the shell construction and installing one directly.

That's exactly how I decided. Two offers are on the table and it will be installed. It's simply that humidity affects me and ruins my enjoyment. For that reason, my preferences were more towards Scandinavia or Patagonia rather than Asia.
I know people who are less bothered by it; for example, my wife likes to sit directly in the sun, while I always sit in the shade. So at the café, we always look for spots where both are possible :rolleyes:
I think that even here you can calculate a lot, but ultimately, -for me- personal well-being is what decides.

What kind of sums are we roughly talking about here for a new build?

So far, I have (unfortunately) only retrofitted. The rule of thumb is €1000 per kW of cooling capacity. So a 2.5 kW device from a reputable manufacturer (Mitsubishi Electric, Daikin...) should cost under €3000. All inclusive.

In a new build, the refrigeration system construction might be somewhat cheaper because it doesn't have to lay cable ducts and the hole is already in the wall. However, someone else would have to chase the walls and possibly do core drilling... So it probably evens out.
The main advantage, however, is that you don't see the installation in the end and all holes will be neatly sealed. The electrician can also neatly lay a separately fused line. And maybe hang a meter (for curiosity) next to it on the DIN rail.
And most importantly: you get the condensate drained specifically, without a pump.

Especially in a properly insulated new build, you should keep an eye on the lower performance limit (just like with the heat pump for heating). If you are willing to operate the AC as sensibly as the heating (turn on, let it run), and you don't aim for 18°C, you don't need 5 kW. 2.5 to 3.5 kW is definitely sufficient.