The XR15 has a SEER2 rating of 15.6 and HSPF2 up to 8.1, which makes it a great choice for an energy efficient home. Pair your furnace with a heat pump to enjoy the benefits of a hybrid system. Primarily heating your home while your furnace steps in when the weather gets too cold. Together, they offer reliable comfort that lowers energy cost. The XR15’s SEER2 rating of 15.6 makes it a great choice for saving energy and lowering your monthly electricity use.