On the roof, under the evaporative cooler.

To choose an evaporative cooler, determine the size of the cooler needed, the services of the evaporative cooler, and the correct type of cooler. Consider the accessories required and compare it with a traditional air conditioner.

Coleman does make a portable 12v evaporative air conditioner. They do not make a picnic cooler that does this however.

The evaporative air cooler is an alternative to conventional central air conditioning. An evaporative air cooling system is more economical to operate than a conventional central air conditioning unit.

The global portable evaporative cooler market size is expected to reach USD 4036.55 Million by 2028; registering at a CAGR of 8.5% from 2022