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The Bryant® Legacy™ HYBRID HEAT model 677C dual fuel system can cut energy costs by selecting the most efficient fuel source for your heating needs. During the summer months and on milder winter days, it relies on an electric heat pump for cooling and heating. , Then, as winter temperatures drop, it delivers cozy, gas furnace warmth on frigid days. This dependable system offers 14 SEER cooling, 8.0 HSPF heat pump heating and 81% AFUE gas heat.