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Never. My old unit was at least 20 years. It was a Trane. The new one we replaced two months ago along with a high efficiency gas furnace is also a Trane.
There was nothing wrong with the old condesing unit after spending 20 winters outside of our house naked. Efficiency was the reason we replaced it. I figured another 20 years a new generation of more efficient unit will replace the otherwise working condening unit again.
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