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Save your money and get a variable speed compressor instead. I've used peltiers in the past but efficiency is tremendously low. Wer're talking 500btu for roughly the same power consumption as a compressor capable to do 6000btu.
Regarding car air conditioner you wont believe this but half the power is drawn by the electric fans. On my VW they use 60Amps on full speed. Compara this to about 100W (9A at 12V) for a 12.000btu window air con (60W external fan + 30W internal fan) Improving the condenser design and adding brushless fans would cut consumption significantly.
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