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Side note I just read somewhere that a normal car AC system is a 5 ton 60,000 BTU system. So even if everything was 100% efficient in getting 120,000 BTUs out of a gallon of gas that would be 1/2 gallon per hour at full load. That takes a 30 mpg car at 65 down to 23 mpg. Luckily I don't think it needs 60,000 BTUs continuously. I wonder if better insulation would do more to limit heat gain/cooling loss would help much.
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