anytime after 13 years it is the luck of the draw. I changed out one at our lake home at 14 years....just because I did not want to deal with any surprises when we got there.
And of course the new units are much more efficient.
My unit here is now 10 years old and I will replace it at the 13 year point as well.
Just a matter of choice and peace of mind.
btk
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