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TECs work, but are not very efficient. The traditional vapor compression cycle which A/C systems use is more efficient. He is certainly right that its more expensive and complex though.
He also says that the A/C system robs engine power, but he doesn't address the fact that his electric coolers are running off the car's battery... There is a net loss here due to the lower efficiency of the TECs plus the efficiency hit from the alternator.
If you had a large enough battery, and an alternator delete, you could do this and improve your fuel economy while retaining A/C. However, his system was very underpowered compared to a traditional A/C system that can cool a car in a couple minutes.
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