I got a better one for you.
For when it’s really hot, like “Africa-hot”, sleep nice and cool.
1.) Buy a cheap, $2-3 styrofoam cooler.
2.) Buy a cheap, $5-10 battery operated camping fan.
3.) Buy a $2 bag of ice. Come on cheapskate, get the big bag.
4.) Cut small slot in one side wall of the cooler, about 3-4 square inches total, maximum.
5.) Trace the perimeter of your new fan around on the top of the cooler. If the top only fits one way, be sure the tracing will be on the opposite side of the slot you cut on the other side wall.
6.) Cut out the tracing, about 1/2" INSIDE the line, making the hole slightly smaller than the fan so it can’t fall through.
7.) Fill the cooler with ice, secure the lid tight, place the fan on top blowing down, turn it on and aim the slot (which is now an exhaust vent from the cooler) directly toward your sleeping pad.
This will lower the temp of THE FLOOR AREA of your tent by about 10° in no time. Remember, cool air settles, tent vents are high up and you’re sleeping on the floor. The ice will last most of the night too. I’ve done it and it worked well enough on an 85° night to get some good sleep.