unless of course that is what you are looking for, such as if you wish to instantly cool off from being outside in the sun for a long period of time you would use a fan of which is small and convenient and if you are trying to cool a large room and don't have time to wait for an AC to fill the space with cold air, a fans random streams will cover a large group of people eating lunch in a cafeteria.
True, but fans don't actually cool as much as you think. They blow air around, but the air is usually room temperature (and if you need a fan, room temperature is generally HOT). Sure, ACs take a while, but the benefit from an AC is always worth it.
they may suck in room temperature air however it feels like the air is cooled when it is in motion so it does in fact cool the person being hit by the fans air and sometimes the benefit is not worth it when you suddenly have to leave after waiting for the AC to cool the room, yes it makes it colder but this benefit cannot always be enjoyed
what if the use of the cafiteria is sudden, and cannot be waited on, so they don't have time to be waiting for an AC unit to cool the room, also AC units are generally low-velocity output so unless you wish to press your whole body against the unit you would use a fan, of which yet again, is extremly portable and come in very small sizes, and in any cases i have experienced ac units take at LEAST 20-30 minutes to cool the room to a comfortable condition
If you have AC units like that, then they must be extremely crappy. Good AC units, although more expensive, are worth the price at every turn. Fans, however, generallly only come in one type: CRAPTASTIC. There are some good fans that don't cut the wind in half when sending it to you, but they still deliver air that's room temperature. In conclusion, ACs, although taking a little more time and being more expensive, are better than fans at every other angle.