Yeah, step one in "how to happily live in the heat" is "If you have a disability that makes thermoregulating hard, get airconditioning and rely on it as much as you can without guilt, you're who it should be for" and step two is "if you can, get a small air conditioner anyway, you never know when someone might get sick and you'll really need it".
But like you said, even then it's not great to have to rely on it that heavily or to have to burn electricity on A/C that can't keep up because your buildings and towns are so badly designed. Most A/C is designed to drop the temperature 10 deg C at most so when it hits 40 you can't rely on A/C to get things comfortable anyway, and buildings and landscapes actually designed to handle heat well can often keep at least part of the building below 30C on very hot days even without A/C at all.
(And what the US does is terrible for people with disabilities in other ways, having to swap between 15C and 35C every couple of minutes will screw with you even if you're usually ok with higher temps [it's an occasional migraine trigger for me, which is part of why I feel strongly about this].)
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But like you said, even then it's not great to have to rely on it that heavily or to have to burn electricity on A/C that can't keep up because your buildings and towns are so badly designed. Most A/C is designed to drop the temperature 10 deg C at most so when it hits 40 you can't rely on A/C to get things comfortable anyway, and buildings and landscapes actually designed to handle heat well can often keep at least part of the building below 30C on very hot days even without A/C at all.
(And what the US does is terrible for people with disabilities in other ways, having to swap between 15C and 35C every couple of minutes will screw with you even if you're usually ok with higher temps [it's an occasional migraine trigger for me, which is part of why I feel strongly about this].)