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White and silver colored cars stay cooler than dark painted cars.
Designing a vehicle cab for coolness wouldnt be hard. Vents and underfloor cool intake, less glass, screening, color.
Maybe no a/c or a/c for only 10% of the time, with a passive thermal redesign of the cab.
Maybe that block of ice, sealed in an insulated box with fans could last 24 hours?
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