The architecture is a given (in the UK at least), since we’re not building new houses at a rate that matters, and I doubt many councils can afford to make adaptation a priority. But yeah, even if it isn’t as good, some of the principle ideas can be retrofitted onto old UK stock - awnings are easy (and on the older houses may have been there a hundred years ago!), shutters aren’t that hard, air circulation can be planned, theoretically even recolouring roof tiles or adding a solar cope cage would help. They’re certainly worth trying, though landlords can and will tell you to fuck off, and even Planning Permission might butt in if their aesthetic sensibilities are offended.

Portable AC units (plus fans, because the combo is much more efficient) have the bonus of not stepping on toes, though the ones we sell in the UK are stupid and removed the outside-intake hose - which causes a large functional problem (it draws in uncontained warm air, rather defeating the point) unless you DIY a new one on.

…hm, uh, all of which is a long winded way of saying “you’re right, but the UK is damned”.