>Wouldn’t our bodies have to work less and use less energy to keep an internal temperature of 98.6°?
Hypothetically, but there’s a minimum amount of heat that you have to generate in order to be alive. The biological processes keeping you alive are exothermic, thus the only way to *stop* that heat from being generated is to stop the processes, i.e. to be dead.
Thus, the ideal ambient temperature is the one where your body’s natural energy consumption is minimized *and* all of the heat you generate can be conducted away from you. That temperature is roughly 70F.
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