The legal situation is initially secondary. If something is stolen, it is gone at first and you only get a replacement after 8-10 months with a significant surcharge.
I might have misunderstood this, but the heat pump is supposed to be installed, which means the device is in the HAR. And I don’t think that’s a good idea in an unfinished shell that is not closed ;)
Those who want to have it will also crawl over the scaffolding and jump into the upper floor or cut open the underlay membrane, provided there are already windows installed.
But if you like the risk. Ask any craftsman what is currently being stolen, almost everyone can tell you stories you wouldn’t believe.
PS:
My electrician refused to lay a single copper cable as long as the shell is not completely closed, because only then does the insurance pay.