Hypothalamus

Your hypothalamus is like a thermostat except in your brain which is pretty cool the hypothalamus knows what your body temperature should be 37° (98.6 degrees Fahrenheit) And if your body is to hot it tells us to sweat and if it's to cold it tells your body to shiver.  When it happens it cools your body down and gets your temperature up back to body heat 37° (98.6 degrees Fahrenheit)