How would one determine the upper and lower temperature limits for a race of human-sized reptiles?

It's a fairly well-known fact that reptiles are ecotherms, meaning that they require outside sources of heat to stay warm and metabolize. However, being too hot can cause heat sickness (not fun), and being too cold can trigger hypothermic states where metabolisms slow down, and movement becomes difficult.

Now, size and shape affect how well creatures retain heat, which also influences how much heat they retain and how well they can retain it. Since the creatures in question are human-sized, humanoid creatures, how would you determine the upper and lower temperature limits?

^{Related: This question is similar in that is discusses temperature ranges, but it's looking more for answers on how to change the range of thermoregulation for endotherms, rather than figuring out the existing range for ecotherms. This question is also similar, but assumes the knowledge of temperature ranges for their creatures. I am looking to find those numbers.}

_{This is a graduated question from the Sandbox}

posted about 7 years ago

Pleiades‭

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