Furnaces with a 96% Annual Fuel Utilization Efficiency (AFUE) rating turn up to 96% of their fuel into usable heat while losing 4% through the exhaust. They have a secondary heat exchanger, which helps recover lost heat and provides better fuel efficiency than single-exchanger furnaces. They heat multifamily homes and are often used in areas with harsh winters where the furnaces' fuel efficiency significantly reduces energy usage and where local code requires higher-efficiency furnaces.
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