Cooling with heat pump via underfloor heating?

Search for rooms with heating cooling is from the Fraunhofer Institute.. The worst thing, however, is the electricity consumption of air conditioning units.

2. a large-area heat source at the ceiling (in case of principle inversion) would have practically no radiant heat effect at the typically low supply temperatures of heat pumps. The supply temperature would have to be well above 60°C for that. That is why almost no one does it like this.

Such a system may run at a maximum of 40°C, otherwise it will roast your head off.

Air conditioners cause more trouble than benefit,

Do you mean conventional air conditioners or the floor cooling with the underfloor heating?

never fight against the thermals, but always incorporate them supportively.

That would also be my basic understanding, but I am not a physicist. From my own experience with such a ceiling heating, I still don’t understand why on the one hand people want to cool their floors and on the other want to heat the ceiling when heat rises from bottom to top.

I see two effective alternatives: endure the heat or work with a real air conditioner. It also dehumidifies the air, which underfloor heating cannot do. And when I make a pizza or something like that in the oven at 250 degrees despite the heat, or just cook (which is supposed to happen sometimes in summer, too), it still keeps the room nice and cool. A floor that is 2-3 degrees cooler doesn’t help me much in that case.

Thank you for the experience report!

We are still waiting for the offer for the cooling function from our heating installer. 3-4 degrees already make a big difference in our current apartment. When the bedroom has warmed up during the day despite all measures and you open the windows wide in the evening, I notice that a 3-degree cooling can already be the difference between "barely bearable" and "suitable for sleeping well."

In the end, as always, it’s a matter of price. An air conditioner is clearly better. But: How many hot days do you have per year when you personally can no longer stand it? And is the approximately 4000 euro price difference worth it to you personally?

With us, the tempering via underfloor heating costs around 4,000 €. The most expensive part is probably the switches. We have it included in the price. In addition, we will run it through BAFA. We should then get back the 35%, I think.

Nobody would think of mounting radiators on the ceiling.

Really not? When I enter ceiling heating on Google, I find very, very many examples/offers.

80% RH is already significantly too high. Mold can occur from 60%, and from 70%, mold is to be expected on most substrates.
Also, a single sensor is of little use, as different values can occur in the rooms.
Air conditioning causes more trouble than benefit if you want to maintain a seasonally varying RH corridor of 50-70%. Even the expensive ones.

So how does the interaction between: underfloor heating, underfloor heating temperature control, and ventilation system work? The air and thus the humidity are gone with the ventilation system, right?