The Preoptic anterior hypothalamus (or POAH) is the part of the brain that senses core body temperature and regulates it to about 36.8 °C (98.6 °F).
References -- Method for Heating the Preoptic Anterior Hypothalamus
External links
The Hypothalamus and Pituitary at endotexts.org See also Hypothalamus Preoptic area Thermoregulation