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While an air conditioner’s efficiency is measured by its SEER (Seasonal Energy Efficiency Ratio) rating, an electric or gas- or oil-fired furnace’s efficiency is measured by its AFUE, or average fuel utilization efficiency. This standard measurement is given in percentages, letting you know how much of your fuel is actually used to heat your Illinois home and how much fuel is wasted. 

On a frosty winter’s day here in Illinois, your gas furnace is hard at work, keeping your Lemont home warm and cozy. Feeling grateful? You’re not alone—it’s one of the most popular forms of heating, as American as apple pie.