Regarding the heat vs cold cock measuring, humans have had methods to mitigate cold enough to stave off death for the most vulnerable for much longer than for heat. Before air conditioning (heat pumps), and still today in regions without AC, death from extreme heat (including suicide and madness),
where such heat exists, was much more common than for death from extreme cold where such cold exists. One could "always" take steps to mitigate extreme cold with preparation (chop and stack wood, for example), but until the 20th century's production of refrigeration, very few had any way to escape extreme heat, no matter what they did to prepare.
Barring getting caught out in the cold (say caught in a blizzard) simply getting to a shelter nearly guaranteed survival, whereas with heat, there was no escape (historically).
Heat is better for crops and an active ecosystem, but only up to a point, and only if water continues to flow... for
short term (weekly or even monthly) survival, cold historically killed fewer if both were equally prepared.
That said, if you can have AC going, heat poses little threat if, as with cold, one simply stays inside.
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