Single-family house Which stone suits us?

the windows were all tilted open when we were at home

Corresponds to my observation of the new buildings without controlled residential ventilation. I don't like that; the controlled residential ventilation was one of the best decisions in our house construction in 2016.

the more porous the stone, the easier the drilling.

I don't think so, or it depends. A highly optimized Poroton stone hardly contains any mass, but only air. Cliché: 6mm drill bit ==> 10mm hole ;-). Sand-lime brick is very grateful in this respect, then the drilling is exactly as desired and every standard plug fits.

Cliché: 6mm drill ==> 10mm hole

But you're at it again using the wrong tool, or rather the wrong "settings". Sounds familiar from my old man. Use hammer mode, put on a big drill and go for it. Instead of drilling a pilot hole without hammer mode and then switching (if necessary at all).

We are getting a bit off topic, but of course we no longer have the windows tilted; instead we ventilate crosswise 2x ~ 10 minutes and after cooking. I also occasionally check the hygrometer. Folded windows have always been part of the cityscape for me, so that doesn't bother me. The windows are of course not tilted when we are not there, so the house is neither more nor less interesting for burglars. Besides that, every burglar walks away pityingly if they risk a look through the window ;) Regarding the material, one must say that craftsmanship stands and falls with the tools; my 6 mm drill bit also makes a 6 mm hole (the drill bit is straight and the chuck is not worn out). If you know the properties of the material, that also has advantages; aerated concrete becomes stable when compressed, therefore the "mega giant impact anchors" can hold half a pig ;) ... as I said, you just must not be too delicate. Otherwise, BehaElja has already said many things; more important than the material is a company that understands its craft.

But once again you are using the wrong device, or rather the wrong "settings".

No, take a look at a heat-insulating Poroton brick from the inside, it is a highly porous body. It has nothing to do with impact (which I could have mentioned though).

Drilling in aerated concrete is so easy. It almost doesn't matter which drill bit you use, because even a wood drill bit goes through it like butter. For simple things, standard anchors are fine. Only if you want to hang something heavy (e.g., kitchen cabinets, etc.) should you use special anchors. I once got the tip to drill the hole half a size smaller and to hammer the anchor in properly. I tested it. But to hang something small, a 6mm drill bit with a 6mm anchor works. And for heavy stuff, you use the aerated concrete hammer-in anchors anyway.

To avoid misunderstandings. I said nothing about aerated concrete. I only wanted to supplement the statement: "The more porous the stone, the easier the drilling" against the background of increasingly porous Poroton stones, as these highly insulating bricks hardly have any mass left, making it sometimes difficult to create a clearly defined hole.