4SHP18LX Up to 20 SEER Up to 19 SEER2 Up to 10 HSPF Up to 8.5 HSPF2 4SHP22LX Up to 22 SEER Up to 20.9 SEER2 Up to 11 HSPF Up to 9.5 HSPF2 4SHP20LX Up to 20 SEER Up to 10 HSPF 4SHP17LE Up to 17 SEER Up to 16.2 SEER2 Up to 8.8 HSPF Up to 7.5 HSPF2 4SHP16LE Up to 16 SEER Up to 9.5 HSPF 4SHP15LE Up to 15 SEER Up to 8.5 HSPF
