4SHP15LEUp to 15 SEERUp to 8.5 HSPF 4SHP16LEUp to 16 SEERUp to 9.5 HSPF 4SHP17LE Up to 17 SEERUp to 16.2 SEER2Up to 8.8 HSPFUp to 7.5 HSPF2 4SHP20LXUp to 20 SEERUp to 10 HSPF 4SHP22LXUp to 22 SEERUp to 20.9 SEER2Up to 11 HSPFUp to 9.5 HSPF2 4SHP18LXUp to 20 SEERUp to 19 SEER2Up to 10 HSPFUp to 8.5 HSPF2