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AFUE stands for Annual Fuel Utilization Efficiency, and is expressed as a percentage of how energy efficient the heating system is. A higher AFUE means higher efficiency.
These can be combined with an electric heat pump to enhance comfort and fuel efficiency by alternating between electric and gas heat, optimizing energy use and minimizing heating costs
* Based on Iowa. This chart depicts potential energy savings you can expect from the ML180 & ML195 furnace, versus older furnaces with lower efficiency ratings. Criteria used in this example are 2,000 full-load heating hours, with a 60,000 Btuh heating design load and $1.368 ccf for gas. Your actual savings may vary, depending on the weather patterns in your local area, local fuel rates and your individual lifestyle.