- SEER up to 21, Modulating compressor, 12year warranty on compressor, Good reliability record, Energy Star Qualified
- Some other systems are more energy efficient
- The Trane XV20i is Trane's top-of-the-line central air conditioner, with a SEER of up to 21 and a modulating compressor that saves energy and keeps temperatures within a half degree of the thermostat setting. It's not the most energy efficient central air...
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