I live in Arizona. Our temperature predictions for the next 5 days are (all in deg. F):
104 (Thurs)
108(Fri)
112 (Sat)
115 (Sun)
117 (Mon)
Today it's a very pleasant

97 degrees here, but we still need the AC.
Without an AC we won't be able to live here. The invention of AC started the move from other areas of the country to here. It is not a luxury. It is a necessity here. All buildings and all cars are air conditioned during summer (and heated during winter).
Of course we could be more prudent in its use, but that applies to most things. Quite often the temperature is too low in some areas of the building, so I always keep a sweater in my drawer. In movie theaters it is usually cold for me, so I do carry a sweater or a jacket there too. However, what's too cold for one person can be just fine for another, or even a bit too warm for yet another. So it makes sense to keep the temperature on the low side (one can wear a jacket but can't take clothes off, especially at work). If I get tired of being indoor, I just step outside for a few minutes to get some fresh air.
When carried to extreme, it wastes energy.
As one measure, there is a sign on both entry doors "Please use the other door". By keeping one out of two doors, there is some energy saving. At home we program our thermostats to maintain cooler temperatures when we are home and use higher set points (by 5-6 degrees) when we are not.
There are environmental concerns, obviously, but I am grateful that we have AC everywhere in this part of the country. Otherwise I wouldn't have moved here. I love not having to shovel snow in winter.