| XP21 | xp17 | xp14 | 13hpx | ||
| Best | Better | Better | Good | ||
| Seer Rating up to | 19 | 18 | 16 | 13 | |
| Compressor | Two-Stage | Single-Stage | Single-Stage | Single-Stage | |
| HSPF Rating up to | 9.7 | 9.5 | 9.5 | 8.0 | |
| SunSource Solar Ready | Yes | Yes | No | No | |
| SilentComfort Technology & Sound rating | Yes – 67dB | Yes – 62 dB | No – 71dB | No – 76dB | |
| Lennox Rebates | Yes | Yes | Yes | No |
