This paper presents a new method of air flow control in fan coil unit using fuzzy logic control. Fuzzy logic control, which has gained popularity in recent year due to its simplicity in application to practical situation demanding a non-mathematical model based control strategy, is applied to the control of temperature in air conditioning area using rate of air velocity. A performance comparison between constant air velocity and derivative controls of the temperature is made with fuzzy logic control. It was shown that the fuzzy logic controller performed better in term faster settling time of the room temperature and increase comfort. The fuzzy control is able to give a more robust control of the temperature with respect to dynamic response during the pull down of room temperature.
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