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High efficiency gas furnace. The efficiency of any furnace is measured in Annual Fuel Utilization Efficiency AFUE . The AFUE shows how much of the fuel you .Learn how an XV energy efficient gas furnace from Trane can improve the comfort of your home. This premium, high efficiency gas furnace provides superior .Discover the heating benefits of a two stage gas furnace without sacrificing efficiency. The XL high efficiency gas furnace by Trane is rated up to AFUE .The XR forced air heating gas furnace offers our highest energy efficiency in single stage performance, which means more of your energy dollars go toward .