It may sound odd to some, but gas furnaces do use electricity! Though electricity is not what is used to heat your home, some parts of your furnace rely on electrical components to function. From its circuit board to blowers, your furnace relies on electricity to keep it running. Your furnace also likely has an electrical switch that can control whether it is lit or not too. Ask your trusted HVAC service provider to show you how your furnace works for a better understanding of why your furnace requires electricity.