Actually, the chance of needing a furnace replacement is HIGHER with a gas unit, because burner gas condensation can corrode the heat exchanger, also the expansion and contraction of the metal as it heats and cools can cause cracks in the exchanger. EITHER of these conditions can cause carbon monoxide fumes to enter the air stream and be circulated through the building to the detriment of the occupants. Oil burners typically need a larger chimney than a gas unit, and electric furnaces are "money pits" unless you are in the TVA or other heavily subsidized electric area.





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