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Longer Lineset Needs Larger Size?
Old unit is still running, but it's got to be on its way out (20+ years old). It will probably be replaced with a 410 refrigerant unit, and so my question is: With a lineset run of 40 feet, with 8 feet of that being a vertical run (the unit is in the attic), will it need a larger-diameter-than-usual lineset? If so, I guess that solves the question of clean vs. replace on the lineset...
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It depends on what size lineset you have now as well as what size unit you will be putting in. It might not even have the right size to run the 410 to start with.
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40' isn't a long line set.
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