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Two things are important to think about. First, newer furnaces use less energy than their predecessors, thanks to improvements in technology and a greater emphasis on energy-efficient design from manufacturers. Second, as a furnace ages, it becomes less efficient as parts wear down and don’t work like they once did. In both these ways, your older furnace is costing you more on your energy bills than a new system would. These costs can add up over the years. It might be better to just buy a new system.