[ELI5] How does our body figure out what is cold, hot and temperature around us without any built in thermometers?

Question

[ELI5] How does our body figure out what is cold, hot and temperature around us without any built in thermometers?

In: Biology

Answer 1

I thought the hypothalamus was our body’s internal thermometer?

I’m not educated in biology or anything. It was just a general idea I had. Open to corrections.