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"Heat index is very much like the wet bulb thermometer, only it adds the metabolic heat that a human has that a thermometer does not have," Romps said.

By cooling blood that then circulates back to the body, they can dump a lot of their metabolic heat to the environment.

Until about 2010 the only explanation scientists offered pig farmers for why their animals gained less weight in the summer was that the heat-stressed pigs eat less to reduce their metabolic heat production.

You’re not generating a significant amount of metabolic heat, and the remedy for that is just to turn the cooling system off completely.

This temperature difference allows us to dissipate our own metabolic heat by sweating.