[holgerschurig]

Well, even today, using heat pumps is cheaper on the long run (like on a 10 year horizont). Especially if you have solar on your roof and can use your own solar electricy, at least partially.

Besides the "big heat pump" outside that sometimes needs changes to the house (like installing underfloor heating) people are now starting to use normal split-AC devices with a SCOP of 3 or better for heating. That's even cheaper.