Tempstar® offers a 95% AFUE (efficiency rating) for a GOOD high efficient gas fired furnace. With a two stage gas fired furnace and a variable speed blower motor, you will have the BETTER high efficiency gas fired furnace in the industry. The BEST option available is a 95% AFUE with the two stage furnace and a heat pump (Known as the HYBRID SYSTEM). This will give you the ultimate cost savings available.