as soon as I saw the article headlines on google "Iranian city breaks heat record" I instantly knew it was going to be Ahvaz.
good ol Ahvaz, I have very strong connections to that city/Khuzestan. in the summer time, the streets turn into a ghost town midday for this very reason. just unbelievable heat.
but with that said, id argue it has irans best weather in the winter. Perfectly mild. And in the summer times, I can honestly say ive felt tehrans heat a lot more then Ahvaz (even though Tehran is a good 10~ degrees+ cooler in the summer)
In Ahvaz everyone has a cooler ghazi. it doesn't matter if your some poor arab from lashgar abad who can barely afford food. AC is more important then food there. the Air conditioning infastracture is very high.
in Tehran though, a lot of people use those crappy water AC's (cooler abi's) which in my opinion do absolutely nothing to cool down the summer heat, but also create humidity and makes it even more uncomfortable. I don't even know why those things exist. They are glorified fans. I could count on 1 hand the number of coole abi's I have seen in ahvaz