| Xc21 | xc17 | xc14 | 13acx | |
| Best | Better | Better | Good | |
| Seer Rating up to | 21 | 18 | 16 | 13 |
| Compressor | Two-Stage | Single-Stage | Single-Stage | Single-Stage |
| R410a Environmental Friendly Refrigerant | Yes | Yes | Yes | Yes |
| SunSource Solar Ready | Yes | Yes | No | No |
| SilentComfort Technology & Sound rating | Yes – 69dB | Yes – 62dB | No – 71dB | No – 76dB |
| Lennox Rebates | Yes | Yes | Yes | No |
