The purpose of this study is to investigate thermal comfort levels of a naturally ventilated and air-conditioner office. Field experiments conducted in an office room in Universiti Putra Malaysia (UPM) used survey questionnaires and physical measurements. When air conditioner was working, it was found that the office was slightly cool based on ISO 7730, but result of survey revealed that staff found condition to be cool. In naturally ventilated condition objective result showed that this office is uncomfortable but subjective study revealed that staffs found condition to be comfortable. Results of over 40 survey responses to thermal comfort questions in study room at UPM are presented. Responses from those staff suggest a wider acceptable temperature range for occupants.
