You may also have an issue with your thermocouple or thermopile, which helps detect whether your pilot light is on or not. Your thermocouple is an essential safety device that makes sure your gas valve is not sending gas into a furnace without a working pilot light.
Ask your technician for ways to increase your furnace's efficiency.
Blower Motor and Fan Moves the Heat (Air Handler)
This system is also known as a ducted warm-air or forced warm-air distribution system.