Are you staring down another brutal Chicago winter, dreading the moment your old furnace kicks on, sounding like a disgruntled CTA bus and costing you an arm and a leg in gas bills?
What in the Heck is AFUE Anyway? (And Why Chicagoans Care)
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Alright, let’s demystify AFUE. It stands for Annual Fuel Utilization Efficiency. Think of it as your furnace’s MPG (miles per gallon) for heat. It tells you how much of the fuel your furnace burns is actually converted into usable heat for your home, versus how much just escapes as exhaust. For example, an 80% AFUE means 80 cents of every dollar you spend on fuel goes to