Inadvertent intraoperative hypothermia is one of the most common complications in patients undergoing anesthesia. This condition is strongly associated with several adverse clinical. At Siriraj Hospital, a previous study revealed a high incidence rate of 74.4%, with only 16.3% of patients receiving intraoperative temperature monitoring. In response to these findings, Siriraj Hospital implemented a perioperative temperature management guideline in July 2024. However, it remains to be evaluated whether the implementation of this protocol has led to a meaningful change in clinical practice. The primary concern is whether the adherence to temperature monitoring for surgeries exceeding one hour has improved from the historical rate of 16.3%, and subsequently, whether this has resulted in a decreased incidence of hypothermia.