Air-to-air heat pump air conditioning? Comfort character?

Hello,

someone recently drew my attention to the [Luft-Luft heat pump] and it sounded interesting. What are your opinions on this? Does anyone happen to already have one? Unfortunately, I don't know anyone in my circle. How does the warmth "feel"?
It would also be interesting to know how it behaves regarding air conditioning. Do you actually get a significant difference to the outside temperature in the height of summer?

Thank you very much for your opinions (preferably from those who actually have one installed).

I have installed 2 x 3.5 kW split air conditioning units at central points in my house (120 m2, well-insulated old building). I use them both in summer for cooling and in winter for heating. Both work very well. In summer, 22 degrees are even maintained in dehumidification mode (very quiet and almost no draft). However, there is external shading on all windows.

Heating with them also works wonderfully. Usually, I run the units in winter (October to April) between 3 and 10 hours a day (because of photovoltaics). On very cold days, I also use my small 4.5 kW wood stove. At night everything is off. Room temperatures in the morning are mostly around 20-21 degrees.

If the slight humming/whispering and the slight (in winter warm) draft don’t bother you, you can live very well with it. My wife is also satisfied. The only important thing is that in my case all doors have to remain open.

Energy costs are minimal. Due to photovoltaics and good insulation, last year I only had to buy just under 1200 kWh of electricity and about 1.5 m3 of firewood. Unfortunately, hot water is still generated by gas at the moment. That is another approximately 3000 kWh of gas per year.

We have had similar experiences with it; moreover, installing the air conditioning was our best decision ever. In summer, there is an abundance of electricity coming from the roof, so the house is "cooled" for free – never again any other way! We always use the heating function (we have a Daikin split system installed) selectively, depending on whether we are using our fireplace or not. We also have an infrared system installed in the house, which we hardly use, only occasionally or in certain rooms when needed. The only "difficult" thing for us is that the warm air in our high gallery area doesn’t reach downward as well. This heating is often disparaged as a "hairdryer," but we do not perceive it that way at all; quite the opposite, we especially like the quick and short-term heating option. Like everything, it has to be well planned, and maybe you have the opportunity to take a closer look at it now in the approaching winter. We would install an air conditioning system again at any time, and in that sense, you already have heating in the house, which this heating option automatically includes.

Please first differentiate here between split air conditioning and a real air-to-air heat pump. And where should it operate, in a new building or an old building?

Ah ok, I didn't know until now that there is a difference. For a new build.

In new constructions, it is one of the cheapest options to install a heating system, but in various forums homeowners report that despite careful planning, electricity costs rise.

Especially depending on the region, comparable houses have about double the costs.

At the latest when winter breaks in on the Swabian Alb and the auxiliary heaters kick in, the clock is ticking.

And the tale about photovoltaics powering the heat pump in winter is wishful thinking, which might work in the Rhine valley.

Therefore, if new construction, please opt for an air-water heat pump. With proper planning, maximum flow temperature, and installation distances under 10cm. Please calculate without additional heating. And very importantly, leave out the safety margins, otherwise you operate your house with a far too large heat pump.