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If you can afford it, you will be well served to upgrade to a 90+ furnace with sealed combustion that draws outside air for combustion. Most of the brand names are good.
There is nothing wrong with a Janitrol. They are one of the largest makers of furnaces. Life expectancy of furnaces are between 15-20 years and you are approaching it.
If you choose to replace your heat exchanger it will extend the life and it won't hurt you. You will still have a less efficient unit, but it will work.
If it was mine......replace it!
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