Here in Vietnam nearly all ACs are these minisplit type. It costs about 500,000VND ($19) to get one serviced, including replacement coolant. It's cheap enough that I get it done at least once or twice a year for all units (the coolant doesn't always need replacing but I get it cleaned and serviced).
I know the US and Vietnamese economies are very different, but something doesn't add up there.
Minisplit AC units are not very popular in the US. The US mainly uses either central air conditioning units or all in one AC units that are designed to be installed in a window. The window units are cheap, but inefficient. The central units are more efficient, but very expensive. Minisplit units are more expensive than window units (by probably a factor of 10), but are more efficient than either. I suspect most people in the US do not know that minisplit units are even an option.
In my home, I recently had a heat pump unit replace my central A/C with some minisplits that connected to the exterior unit installed in the basement. The entire setup cost as much as it originally cost to install the central A/C, despite parts of the central A/C being reused.
Note that in the US, what we call air conditioners only support cooling and not heating. When they support both, we call them heat pumps despite that being the scientific name which applies to the cooling only units too.
I don't think it's just "most Americans don't know."
When I installed AC in my former Bay Area home, I would have needed multiple mini split units to cover 1200sq ft, with questions about how many you could have on at once to still get the right performance. I went with a single central air unit instead.
It also (at the time at least) didn't come with a centralized thermostat, which meant managing each room individually (that would've been fine with me, personally, but it's a drawback for lots of people).
On top of that, many (if not most) mini split units are also somewhat aesthetically displeasing.
In my new home (on a different continent), I have mini splits. I'm somewhat satisfied with them, at best. I'd still prefer central air but it's not a thing for residential homes here.
If I were to ask most people I know offline, I suspect only a small number of them would know what a minisplit unit is. For most people, A/C is like plumbing. They do not think about it until it breaks. Learning that there are better options is just not something that people do.
That said, I was replying to someone from Vietnam. Assuming that things in Vietnam are similar to China and Japan, people will only heat or cool the specific rooms that they are using, rather than heating or cooling everything like how many Americans do things. Those in the US who cannot afford to heat or cool everything, who are likely very underrepresented here, would be those using window units, since they are cheap upfront. A minisplit would be cheaper over the long term, but the high upfront cost dissuades people in thing market from even looking at them.
Finally, I had Fujitsu minisplit units installed in my basement two years ago. They are far more aesthetically pleasing than window A/C units.
How long of a long term are we talking about? I suspect this is very dependent on many factors (not least of which is labor, but also insulation, climate, etc).
The energy (gas+electric) bill for my whole home would've taken well over a decade to add up the amount the mini split installation alone would've cost, so even if it brought down my energy cost to zero (which it wouldn't), it would've taken a decade to pay for itself (including the cost of window units).
Edit: and yes, they're prettier than window units for sure, but as you've pointed out, they're not competing with window units. They're competing with ducted central air that has almost no visible impact.
Its really expensive, its true. Prices spiked like mad after the coronavirus shortages, AC parts were back up forever. It sucked and the costs rose tremendously and seemingly never fell. Then we tarrif the imports and change the rate constantly. Nobody can sort out their supply chains(But it is not just the tariffs).
The refrigerant is often expensive, poisonous and flamable. We don't replace the refrigerant, we reclaim it and dispose of it properly. Its not without risks. Our building codes are pretty rigid as well, its a big pain point.
New HVAC install is gonna need an electrician, the lines pass through walls allowing the possibility of condensation to produce deadly mold. Every installation needs individual consideration. If it isnt %100 perfect, the customer will be riding the installer's ass.
The US has is a Safety Above All mindset on some things. We improve safety far beyond economic rationality because we don't want to systematically kill each other in this way, however few that is.
Unrelated example: a national EMT outfit operating here made all their techs wear plate carriers and ballistic plates. There is nearly no gun violence here. All the techs stopped carrying the plates after a few months because its dumb, and wont stop a baseball bat or a knife, but this is a national outfit, surely they did a cost benefit analysis. Someone signed the check and wrote a policy to make them wear em every day. Plates expire, also.
That said, we can definitely do better, and the cost is too high. Installers are in demand, and we tariff the imports to the tune of %15-%30.
I wonder if they just let super polluting gas free
Almost certainly. Although at least they all use the newer R32 coolant these days. A typical AC unit uses 0.5 to 1kg of R32 coolant, and releasing 1kg is about the same as 1 person taking a 1000km flight (from a quick search). If you replace the coolant every two years it'll pollute much more from the electricity used than the coolant being released.
IIUC grandparent is in Norway as he quoted the price in NOK.
Oh good catch. Somehow my eyes skipped over NOK and just saw the $2.3k.
... Why does someone in Norway need a split AC unit? I don't think they're very efficient for heating.
EDIT: I researched this and it seems the type designed for heating in negative zero temperatures are much more expensive. So maybe that explains it?
Similar to Finland. Quite lot of time in the year like right now outside temperature is above zero, but below say 15C. So heatpumps are in very good efficiency range.