Trane’s XL and XV series central air conditioners are Trane’s high end systems. Most of the XL and XV series A/Cs are multi-output versus the single output systems found in the XR and XB series. These are Trane’s quietest and most efficient A/Cs with efficiency up to 21 SEER and sound decibel ratings as low as 55 dBs. And when paired with ComfortLink™ II system, these units are at your control from anywhere.