The Lennox XP25 Variable-Capacity Heat Pump features an industry-leading cooling efficiency of 23.50 SEER (Seasonal Energy Efficiency Rating) and a HSPF (Heating Seasonal Performance Factor) rating of 10.20. The XP25 is also able to modify its output based on the area of the country in which a homeowner lives using Climate IQ technology. In warmer climates, the XP25 adjusts its airspeed to allow for greater humidity control, while in cooler climates, the system’s startup is slower to allow for the air to absorb more heat before circulation.