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.
Replace the furnace filter at least once every 90 days (set reminders to check the filter every month). Write the date of replacement on the filter itself so you know exactly how long it has been since the last filter change-out.
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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