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Yeah, I find it hard to take this seriously.

First of all a sustained 20 amps is HUGE.
It sounds like he is using peltier devices for the cooling.
They get cold on one side, but get get very hot on the other. In the case of AC it is as much of a problem to get rid of the head as it is to cool. That is why such devices are used in AC systems.

One AC trick that I have seen make a huge difference is switching to the new radial SANDEN compressor. They only take a couple HP to run as compared to the 20 or 30 the old cast iron compressors consumed and they will get your truck ICE COLD!
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