Cooling with heat pump via underfloor heating?

Nice, but nothing more.

I agree. A heat pump only lowers the temperatures slightly during prolonged heat waves if the heating surface is not also optimally designed for cooling. That usually means a concrete core activation in the concrete ceilings.

but a gentle breeze can already be enough to keep the temperature "bearable" :cool: Surely an air conditioner is more powerful, but it is also pure electric cooling. A brine-water heat pump can, however, under certain circumstances, do that without extra electricity! via PC (passive cooling)

We find the summer especially unbearable when temperatures are high and humidity is also high. Regardless of whether it’s a brine-water heat pump or an air-water heat pump, the humidity that ultimately causes the muggy and uncomfortable feeling is not reduced by them. Only an air conditioner can achieve that. Cooling via heat pump is nice, but not comparable to an air conditioning unit. I gladly accept having electric cooling, which at least partially is powered by a photovoltaic system. The cooling effect is much greater. Furthermore, during the transitional period when underfloor heating does not run continuously because it is still too warm during the day, an air conditioner provides suitable heating for early autumn evenings.

when you call the same device air conditioner and it cools

It is not enough to just change the name if the functionality of an air conditioner (= producing cold) is not present.

Where air conditioning units are mentioned here, a question arises for me: Does the actual outdoor unit have to be installed outside or can it also be installed - somehow - for example on a (cold) attic? However, I think there could be problems with humidity if it is not properly drained.

Since the attic can sometimes reach sauna-like temperatures in summer, the COP drops to zero and the system consumes unnecessarily more electricity than needed. So if you want an efficient system, it must be installed outside or the heat exchanger must be able to be freely ventilated with outside air in the attic.

It is also not enough to change the name if the functionality of an air conditioner (= producing cold) is not present.

That is not true. They are all the same systems. Only heat pumps for heating underfloor systems are not allowed to cool down as much as the same devices which directly cool the air. There are just small differences in construction and software that define certain limits.

But every heat pump for heating can also be used for cooling and every "air conditioner" which is always frowned upon and people almost boo when you mention it can be just as easily converted into a heating heat pump for underfloor heating.

Marketing and advertising slogans are everything. One is vehemently rejected by customers and the other is gladly accepted. And underneath the casing, both are the same system.

That is not true. They are all the same systems.

Then I expressed myself incorrectly. Due to the application, the heat pump cannot operate as an air conditioner. Technically, they are both the same and of course closely related to the refrigerator. There you can clearly see what happens with strong cooling – condensation water. That is why the underfloor heating only works "semi-optimally" ;-)

I am glad that our heat pump can do that, it helps in summer. Air conditioning is better though, ceiling cooling is better. 2. It works with the heat pump, but then it costs more than 1000€.