An air conditioner for a tent or 12 volt fans for camping are fairly inexpensive, lightweight, and easy to move. Many tent ac units run on batteries so there is no need to be near a 110v outlet at the campground. The cost of a tent ac can run from $50 all the way up to a few thousand bucks.
Many tent air conditioners work by attaching to a cooler filled with ice. They use the fan to spread the cool air from the ice all over your tent. Here is how you can set up one of these units.