Use your head and think about what you just said
"the guy in the video." WHO IS this "guy?" What does HE know. What is his agenda? Is he telling the truth, or just a schill for the company?
What you have here, folks, is a box full of ice water. OK?
This thing should have a great big "Ronco" label on top and "be sold only on TV"
"Calculations?
I used to install and maintain / repair HVAC / R systems. I know and understand the basics of thermodynamics (certainly of a bucket of ice) and swamp coolers.
OK, so here, this is from their own website........ this is a QUOTE
http://swampy.net/faq.html#anchor349576
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"A MightyKool 12-Volt "Ice Water" Model uses from 10 to 20 pounds (4.5 to 9 kilograms) of ice PER HOUR or more to produce between 5,000 and 8,000 BTU. "
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PLEASE READ THAT AGAIN!!!! This means that for every hour you are tootin' down the road in the hot summer heat, with that marvelous unit outputting a whole "5-8000 BTU" of of "cooling" you will have to stop and buy ANOTHER 20 lbs of ice somewhere.
A typical auto A/C is probably somewhere around double that BTU rating by the way, maybe more on some vehicles