I hate the heat, really hate it, but have lived in 40°c+ heat. It is difficult to compare because it is a hot country, so houses are generally equipped for it - blinds as standard on every window, tiled/lino floors, air con, lots of ventilation, 99% of properties have a balcony and most have a pool (own if in a house, generally a shared one for apartment blocks). That's part of the problem when we get this heat in the UK, our houses tend to become red hot because they're built for a (generally) colder climate. 😩
If it does get this hot, stay indoors if at all possible, in the shade (windows open but blinds or curtains closed) and drink plenty of water. Even if you don't feel too thirsty, make sure you're well-hydrated. Fans might just blow hot air around, but having a fan pointed at you will help (I've found). If you don't have air con at home, if you can quickly get in the car, air con does make a nice change, I've previously went for a drive to have it on and keep a bit cooler than I would be in the house!