Air Coolers and Air Conditioners are very similar in terms of distributing cool air. You can set the desired temperature of the air an Air Conditioner distributes however, you're unable to control the temperature of the Air Cooler due to an evaporation method.
Air coolers don’t require any outside ventilation, while air conditioners must be vented.
Air coolers work best when placed near an open door or window.
Air conditioners can lower the temperature far more than is possible with an air cooler.
Most air coolers can also be used as a humidifier. You can read our blog article which gives a detailed breakdown of the difference.