In recent times, the use of furnace in industrial sectors has increased. Furnace deals with high temperature for melting and die casting purpose. The smart gas furnace basically made by G.I metal sheet (outer part of the furnace), solenoid valve, ceramic fiber, Plaster of Paris, black fire cement, crucible and gas as a fuel. Among different types of furnace, higher efficiency can be achieved from smart gas furnace. A smart gas furnace is the minimum expensive melting process introduced for melting any types of metal or alloy compared with other furnace. The objectives of this project work are to control the flow of gas for maintaining the required temperature inside the furnace and melt the material. The goal of this project work is to build a gas fired crucible furnaces and develop a controlling system which provide more benefit compare with other furnace. In this project Arduino is used to maintain the required temperature inside the furnace by switching the solenoid valve which controls the flow of gas. Whenever the temperature reaches the desired temperature the gas flow will automatically stopped by solenoid valve resulting in minimum gas loss. Which will reduce fuel cost. Thermocouple is used as a sensor. It continuously sends data (temperature) to Arduino, and by comparing the both data (required temperature and available temperature inside the furnace) the Arduino switches the solenoid valve.