American Standard Ductless Systems 4MXC8 Cassette Indoor UnitUp to 16 SEER2 NAXDKS Horizontal-Ducted PEAD Horizontal-Ducted Multi Zone NAXFKSUp to 28.2 SEER2Up to 13 HSPF2 PEAD Horizontal-DuctedUp to 19.4 SEER2Up to 12.1 HSPF2 NAXSSTUp to 24.6 SEER2Up to 12.8 HSPF2 NAXWMTUp to 18 SEER2Up to 10 HSPF2 NAYSSTUp to 24.6 SEER2 NAXWSTUp to 24.6 SEER2Up to 12.8 HSPF2 NAXSPBUp to 33.1 SEER2Up to 13.5 HSPF2 NAXWPH NAXSMTUp to 18 SEER2Up to 10 HSPF2 NAXWPHUp to 33.1 SEER2Up to 13.5 HSPF2 NAXSKSUp to 16 SEER2Up to 9.6 HSPF2 MSZ-EF NAXMMXUp to 22 SEER2Up to 11.5 HSPF2 NAXWSTUp to 24.6 SEER2Up to 12.8 HSPF2 NAXUKSUp to 22.3 SEER2Up to 13.3 HSPF2 NAYUp to 24.6 SEER2 NAXFKSUp to 28.2 SEER2Up to 13 HSPF2 NAXFKSUp to 28.2 SEER2Up to 13 HSPF2 NAXAMTUp to 17 SEER2Up to 13.6 HSPF2 NAXCKSUp to 16 SEER2Up to 9.6 HSPF2 NAXCKSUp to 16 SEER2Up to 9.6 HSPF2 NAXDKS Horizontal-Ducted Multi Zone