Did you ever remove your A/C?

Look it up... the guy in the video has been using it for over a year with nothing but good results in a vehicle that has like 5 times the interior volume of an A-body. Water holds a huge amount of heat energy. You got proof it won't work i'd like to see your calculations.

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

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Folks please use your heads and think. ENERGY. Energy is energy is energy. It matters not how you "think" of energy. You can mathematically compare "the energy" in a gallon of gas, a pound of L/P, or a big lump of coal. The reason you cannot pedal your bike up to 100 mph is that you don't generate enough energy. You can after a fashion, compare watts to BTU to calories, to horsepower, to pounds of steam per hour.

What I'm trying to say, here, is there is a REASON those A/C units on cars "lug down" the engine in heavy traffic. There's a REASON why some of them have dual drive belts. They take actual energy, actual torque, horsepower, and fuel to operate, and that ain't free, by any sense of the word