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Desrtopa comments on Open thread, October 2011 - Less Wrong
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Probably, by considering how there are several ways to "create" heat (burning, rubbing things together, as Oscar says), but none of "creating" cold. That makes more sense in a model where heat is a substance that can be transmitted from object to object, and cold is merely the absence of such a substance.
A number of substances have high enthalpy heats of solution, and appear to "create" cold when added to water. Some, like calcium chloride, would likely have been known in Classical Greece.
Edit: My mistake. Dissolution of calcium chloride is actually exothermic. I'm not sure if any salts which have high endothermic dissolution occur in a naturally pure state.