Malaysia is a country which has one of the biggest Muslim societies in the world, followed by a large number of mosques scattered in various places and these mosques have maintenance problems especially in energy consumption. Mosques normally experience sudden influx of users at five specified times throughout the day, and the use of the fans in the mosques is very inefficient and wasteful, corresponding with the five daily Islamic prayers. Regarding this matter, this project is conducted in order to reduce mosque energy consumption by developing smart mosque temperature control. The temperature control aims to focus on reading the temperature of mosque and then smartly controls fan according to the temperature reading by applying Internet-of-Things (IoT). The Arduino Uno controller board will read and process the sensors to trigger the fan switch. The act of controlling the fan according to the ambient temperature of the mosques will help to reduce power consumption. The smart mosque temperature control can be applied widely in Malaysia to make mosques smarter and efficient in energy consumption.