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An Efficient Furnace Is a Good Buy in SW Illinois—but How Efficient?

Furnace efficiency is an important factor in keeping your energy costs low. A furnace’s efficiency is measured by a percentage using the annual fuel utilization efficiency (AFUE) rating. Available new furnaces come with AFUE ratings ranging from 78 percent for standard-efficiency models to 90-98 percent in high-efficiency condensing furnaces. The AFUE rating measures what percentage of…

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