Yeah, it's different in the USA for sure and hard to tell what's going to happen in the near future. FYI cheap air-to-air heat pumps (2-3kW) can be bought here in Sweden for 500-1000 $ with an additional installation cost of, I suppose, around 500$ as well. Larger systems like air-to-water or ground/geothermal-to-water is of course more expensive. Typically up to 15-25 000 $.