At least in Europe, much of the current expansion is fueled by the parallel rise of PV solar installs in households (even without subsidies, both combined result in cheaper heating than gas).
Even now with 10+ years to break even on the installation it's hard to justify if you think you might move in the next decade.
Here in the UK it would cost £7k-£14k for an air source heat pump, and you'd get between £200-300 reduction on your bills.
If you are moving from a fossil fuel heat source, rather than electricity, then you do get a £7.5k grant. But if not, fuck you.