Exhaust fans, or ventilating fans, are often used in industrial buildings for ventilation. In residential buildings, small ventilating fans are sometimes used in bathrooms and kitchens but are rarely used in other areas. This paper explores the potential of ventilating fans to improve thermal comfort in a bedroom of a residential building in the tropics. Experiments were conducted in the Smart Green Home Laboratory at the National University of Singapore. A single-speed ventilating fan was mounted on a 30 cm by 30 cm opening in a test room. An adjacent room next to the test room with an opening of a similar size but without a ventilating fan served as a control room. Both rooms have a dimension of 3.2 m (L) by 3.5 m (W) and 3.0 m (H). A 100-W heater was used in each room to simulate the internal heat load. Four temperature sensors were distributed in each room to measure the indoor air temperature. Experiments were conducted from 09:30 AM to 11:30 AM (morning), and from 01:45 PM to 03:45 PM (afternoon). In the morning, when the heater is turned on, the average indoor temperature in the control room increased by 0.45 ℃/h, whereas the average indoor temperature in the test room with a ventilating fan increased by 0.22 ℃/h. In the afternoon, the rates of increase are 0.49 ℃/h in the control room and 0.22 ℃/h in the test room. The results suggest that ventilating fans are effective in dispersing heat in a residential bedroom, and therefore the potential of ventilating fans is not limited to bathrooms and kitchens.