Understanding Furnace Efficiency Ratings

With winter temperatures regularly dipping below freezing, furnace efficiency in Granger, Indiana is critical. The frigid weather and extended cool seasons push furnaces to the limits as they battle to keep our homes warm. Whether you are researching electric or gas furnace installations for your home, you’ll need to understand the importance of the furnace efficiency ratings.

The AFUE Furnace Rating

The Annual Fuel Utilization Efficiency (AFUE) rating measures how much fuel a furnace uses to keep a space warm compared to how much fuel is wasted through the outside venting system. This resulting percentage identifies the expected efficiency of the furnace in converting fuel to energy. A furnace with an 85 percent rating wastes 15 percent of its fuel.

Meeting Industry Standards

In Southern states, the Environmental Protection Agency (EPA) has set the minimum energy efficiency requirement between 80 and 83 percent depending on the fuel source and system. The threshold is lower for mobile homes, which must reach 75 percent efficiency. Industry leaders, such as Carrier, surpass these standards by building furnace systems that reach 98 percent efficiency. To earn the Energy Star designation, a furnace must achieve at least a 95 percent AFUE. Climate is a key factor in qualification, so gas furnaces may only carry the label in certain regions.

Comparing AFUE Ratings

The highest rated furnaces use modern technology, such as sealed combustion and dual heat exchangers, to improve overall efficiency. Models more than 20 years old likely rate at just 55-70 percent AFUE. You may qualify for energy efficiency rebate programs when you upgrade to a natural gas furnace with a 95 percent AFUE.

Rex’s Heating and Cooling can help you navigate the various furnace systems so that you select the right one for your Indiana home. Contact our Carrier certified technicians at (574) 500-2867 to learn more about our furnace installations options or to discover other ways to improve your energy costs.