How do I find the age of my Lennox York condenser?

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Write down the first five digits of the Serial Number. Use the serial number 5498L9988 for an example. “5498L” will give you the place, year and month of manufacture for the Lennox air conditioning unit. Similarly, how old is my YORK condenser? How can I tell the age of a York air conditioner or furnace from the serial number?

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