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It's not that hard to stop a Trane Six years ago, I replaced the old HVAC system that came with our house, a central forced air system installed in 19951. The new system is a Trane XR AC paired with an S9V2 96% efficiency forced-air gas furnace. And it ran great! Better efficiency, quieter, multiple fan speeds so I can circulate air and prevent stale air in some parts of the house... what's not to love? Well, apparently the engineering: Jeff Geerling November 4, 2025 ...