Dual fuel heat pump and gas package units deliver optimum air comfort and efficiency. Dual fuel heat pumps combine a powerful gas furnace with an energy efficient heat pump in a single cabinet design. For hot summers and mild winters, the heat pump half of the dual fuel package unit will do the job. If it gets really cold outside, the gas furnace acts as a backup heat source to keep your home warm all winter long. Buy a dual fuel heat pump with high SEER and AFUE performance, and you can save money while never sacrificing air comfort.