When it comes to furnaces and HVAC systems, the phrase "an ounce of prevention is worth a pound of cure" definitely applies. Manufacturers know this too, which is why they typically void any warranties if regular maintenance is neglected.
When there is a problem with your furnace, it is usually the thermostat (control system), gas valve/thermocouple/heat exchanger (heat source), or the blower/air handler/ductwork (distribution system). In any case, a trained and qualified HVAC technician will be able to fix the problem quickly and effectively.
Heat Moves to Heat Exchanger
And not all furnaces use natural gas, although most do. Your furnace may run on propane, heating oil, or electricity.
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