Is a portable air cooler the same thing as a portable air conditioner?
No. An air cooler uses water and evaporative cooling to lower the temperature of its airstream, often by as much as 12XF. However, air coolers will not lower the temperature in a room- they only make it feel cooler in the airstream provided by the unit. Additionally, you must add water to evaporative coolers for maximum effectiveness, and they do not need to be vented.