You have repeated the failed arguments of idiots that are killing tens of thousands of people. Everything you said has at least a kernel of truth, but smart people ignore those excuses and fix the problem.
Yes just giving them AC will not fix the problem they have to install it and use it and not go out in 90 F+ degree temperature. The cultural change is part of the fix.
YOU DEFINITELY NEED AC Fans, water, shade are not enough. The same house designs that keep the heat in during winter keep the air conditioning in during summer. Yes you may need to redesign flexible AC's for the older houses. Not impossible to do.
The fans etc. were enough 50 years ago. 30 years ago the deaths from heat starting rising and We already knew about Global Warming You are basically claiming to be caught by surprise from the most famous trend in the last 50 years.
It is NOT a few days each year - that was what it was 30 years ago. Now it is 2 months per year.
The belief that you 'do not need AC' is part of the same stupid culture that has people go out in the sun. You are not part of the solution, you are a moron that thinks "it is not that bad of a problem, we do not need to use the same techniques of people from the equator use." Given the death rate, YES YOU NEED TO USE THOSE TECHNIQUES.
The problem is not measured in days you need AC, it is measured in Tens of Thousands dead. You get more than 50,000 dead it does not matter if they all die on one day, 10 days, or 30 days. That many dead = a problem.
Part of the solution may very well be a constant barrage of radio, TV, and internet propaganda with a Heat Index telling idiots that today is the day you turn on your AC and stay inside. But you need those AC's to exist in order to do this. Trying to do it with fans will fail. The people will think "I am not comfortable, I will go to the beach." Make them comfortable, not just liveable.
Note, I live in the NYC area. I use an AC in my bedroom but a ceiling fan in my living room. The fan works great as long as the temperature is under 90, then I go read in my bedroom. Because I am not stupid enough to think "Well, the fan keeps me alive but uncomfortable, so I do not need the AC." I want to enjoy my life not suffer through it.