Air conditioning: What is the royal way

17 degrees and 22 degrees are still a big difference. If it happens at 22 degrees, then someone really botched it.

This has nothing to do with botching, but is fundamental physics that cannot be tricked at this point.

If this is so great... why does no one install something like that? I have certainly never seen it. Especially in commercial areas, there are only normal air conditioning systems..

I worked for a while in a modern office complex with ceiling cooling and window shading. It worked great. Very pleasant indoor climate without drafts from the air conditioning systems. It was never humid.

For each provider among the first Google results, the page states that something additional must be done against the moisture.

Addendum: I have nothing against cooling ceilings - but they are not miracle solutions and, in my opinion, only work in conjunction with technical dehumidification, which can indeed be present, or is automatically present in the room unit in the case of "classic" air conditioning systems.

We have installed a geothermal heat pump with cooling function (additional charge €700) and the controlled residential ventilation has a geothermal exchanger (additional charge €2,000). This is sufficient for us in combination with shading to maintain the room temperatures even during extended high outside temperatures like recently at a maximum of 24°C.