Many homes that use a furnace are normally well equipped to have them fitted or installed. The main features every furnace should have is a clean fuel system. Whether it is a gas, oil or electric furnace, heat should be produced using a safe and efficient mechanism. Any expert furnace repairman will tell you that the majority of furnace repairs could be avoided were this the case. Regular maintenance is also much recommended in order for the furnace to consistently function in by safe and efficient means.