Healthy Furnace Checklist Regularly Change Filters Ensure motors &bearings are clean and oiled Check thermostat accuracy Make sure drains & traps don't need to be flushed Inspect and clean blower & fan Check manifold pressure Make sure the burners are clean and in good working condition Inspect the gas line If this list seems overwhelming and you don’t know where to start, let us come out and assess your furnace. It may be that we can give it a quick tune-up