What is the difference between Trane XL and XR?

What is the difference between Trane XL and XR is that both are residential lines but XL is premium high efficiency with more features and quieter operation, while XR is mid-range value line with good efficiency at lower cost. Trane XL series includes XL16i, XL18i, and XL20i TruComfort that are premium with up to 22 SEER for XL20i variable speed, two-stage or variable speed compressors for better humidity control, ComfortLink II communicating technology that pairs with communicating furnace and thermostat for precise control, and very quiet operation at 55 to 59 decibels due to sound insulator and variable fan, costing 5,000 to 9,000 dollars installed for 3-ton, with 12-year compressor warranty and heavy-duty spine fin coils. Trane XR series includes XR14, XR16, and XR17 that are value mid-range with 14 to 17 SEER, single stage or two-stage compressors, non-communicating but still reliable, and louder at 70 to 74 decibels, costing 3,000 to 6,000 dollars installed, with 10-year compressor warranty. Key differences: XL has variable speed for better comfort and humidity, XR is mostly single stage except XR17 two-stage, XL has communicating, XR does not, XL is quieter, XR is cheaper upfront. For homeowners wanting ultimate comfort and lowest bills and staying long term, XL is better. For budget-conscious wanting good reliability at lower cost, XR16 offers best value with 17 SEER two-stage.