I live in Sweden. You are incorrect. Having your home basically unlivable a few weeks every year is not ok, and ground heat exchange pumps that provide cooling are energetically basically free, so just do it.
That said, if you are able to get a ground source heat pump, that's awesome, but it's something like 10x to 20x the price of even a really good ceiling fan.
Ground source is overhyped and overpriced. District heating and air-exchange AC is still the winning solution.
try opening your window in +15C high humidity and then sleep.
I assure you, sleeping in a 0-5C sleeping bag on the nearby sea shore would be a more acceptable experience.
You just never lived there, yes?
But if you mean no forced convection, that's just not the case. You can survive at wetbulb temperatures in excess of 30 C, which means 30 C + 100% RH. Hell, my house right now is at about 25 C drybulb and 18 C wetbulb, which from the perspective of evaporative heat transfer is identical to 18 C with 100% RH, so I should be dying any minute. See you on the other side!
but I would not want to live in that bath house.
I'd still favour the fan, I've lived in India for longer periods with consistently around 32-36 C and a fan is perfectly enough after a little while of adapting.
Charge the battery from the solar and it powers the AC in the evening.
You'll generate more than enough during the day to run AC and fill the battery to run it overnight.
Still using grid sources in winter, but you aren't using the AC. Although you might find air-air AC in heat mode is better than your gas boiler.
You can replace farmland, but that seems like a really bad idea with Globalism's decline. Who knows what's going to happen to the food supply chain over the next 30 years. The only other option is attaching them to the exterior of historic buildings, and heaven forbid! Think about the character of the neighborhood!
In the UK Semi, Terrace and Detached is about 75% of households and 80% of people.
If you look only at owners it's about 90% of households (and even higher for population)
And anyone who owns a home is rich. If you can afford 300k for a house you can afford 15k on reducing your electric bill.
Now rental of course is a separate matter, and the real problem.
As housing is so constrained landlords can extract all the money from tenants regardless of the quality, but even if it isn't, renters tend not to value things like solar or aircon. You can spend £10k adding solar to a house, but you probably aren't going to get enough from extra rent to offset the cost of installing it.
In the US a property owner has to provide AC because renters will expect it, same as you have to provide a washing machine connection in a rented place. This is a mindset thing which can't be changed.
In other European countries, but its not changing. Among owner-occupiers its France 80% houses, Germany and Austria 70%.
However the rental issue is far more in those countries, where nearly half the country live in rental. Things like balcony solar work well there, and they can power a portable AC.