It's a big topic everywhere. A lot of early adopters of heat pumps end up with relatively expensive and inefficient solutions because the people that install them barely know what they are doing. There's a lot of demand for heat pumps so most people doing the installation work are very new to this. The good news is that they are probably learning from their mistakes and gaining a lot of knowledge. The bad news is of course that a lot of people are getting a bit of a bad deal.

Things will improve in a few years but until then you really need to be careful with making sure you get the right stuff installed properly by the right people for the right price.