Is a multi-branch gas supply connection usable for an air conditioner?

The first point of contact is the electricity provider, but not the only one. I hope that their requirements within the same local area are also compatible with each other :)

And yes: I would connect my 4th supply at the end, but the PREPARATION for it would already need to be in place. If I haven't laid a conduit and can't use a trench for it, I might as well plan an entirely separate connection. That wouldn't be any more complicated either.

Why not use a ring seal through the basement wall? Then the prefabricated house contractor is out.

Can a utility provider forbid me from laying something in the 4th pipe meiner multi-service house entry that does not disturb the other services? It's nothing more than an additional pipe. But if you want to be sure and/or fear problems, just lay a KG pipe in the floor slab. That's how we did it for additional cables (which go in a different direction than the multi-service house entry, otherwise I would have simply laid them through that) and for the heat pump. The drain pipes also go out there.

Yes. Okay. The endeavor is obviously not quite that common :)

And if the diameter for supplying the outdoor facility is too tight anyway, then it just has to be done with a second hole.

And yes, such a supplier has a monopoly. He can decide whether and when he delivers. My construction water was rejected because the building application is not yet approved, Telekom only installs their equipment if the room can be locked.

Yes, of course, the latter is logical. But suppliers have to provide you in Germany, at least water and electricity. As long as you pay.

So I consider the thing with the MSH to be complete nonsense....... You need two pipes for the refrigerant including insulation and one electrical line. So something must be laid separately anyway.

It would be interesting to hear from people with timber frame construction, which we belong to, how they remove the condensate from the indoor units.

It simply runs out of the indoor units. :D But unlike the aforementioned lines, it does not have to be routed to the outdoor unit. It is sufficient to connect it to the nearest drain. This can also be done under the screed.