Look for a furnace’s Annual Fuel Utilization Efficiency (AFUE) rating. The AFUE, which is described as the heating system’s energy-efficiency performance over a heating season, is expressed as a percentage and should be found in the Energy Guide label that accompanies the product. The higher the furnace’s AFUE rating, the better its energy efficiency will be. Be sure to ask a Denver heating and cooling expert about finding an appropriately sized furnace for your home.
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