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10-26-2012, 02:35 PM #27I think most on hear have been around bad contractors and new construction enough, then when they hear that a new sytem is only lating 8-10 years, it's not unreasonable to suggest that it wasn't installed correctly. IF that's true, the installation issue could be repeated with a direct replacement if the installer doesn't pay attention to details. Line size, ductwork, how it's charged, equipment sizing (don't assume the builder sized it correctly) all play a role is a good, reliable installation. You location is somewhat moderate in terms of cooling degree days compared to a southern state, texas and central states so there's little reason if properly maintained, that a unit shouldn't last closer to 15 years, even builder grade.