No clue. The last time i looked, the prices for a heat pump from known companies like LG or viesmann are similiar than a gas burner.

And with a heat pump you can even invest in PV and use that to be even more independent and later you can leverage an EV car either by never buying gas again or for storage.

Overall a very smart concept.

But perhaps he lives in a country were energy is very cheap, will stay cheap and is very stable?

I think the answer depends largely on the retrofitting cost, then less so on local market conditions. I.e. a niche market has fewer trained technicians and higher margins.

But the retrofitting issues can be substantial, particularly when it triggers updated building code enforcement. An older house with natural gas heating and no air-conditioning may need major electrical upgrades to support a heat pump system. Others may require ducts to be replaced. Or, other invasive work to meet newer insulation standards. Some houses might have some fluid-based radiant heating and require rework because it was designed for the higher fluid temperatures of a boiler while a heat pump system would use lower temperatures and higher flow rates.

Also, many homes may be subject to some kind of aesthetic rules which rule out the mini-split systems popular in Asia. The owner cannot just bolt new equipment or conduits to the exterior of the house. Instead, the above retrofitting tasks turn into major renovation jobs to tear apart interior walls.