Why It’s Important To Understand The Efficiency Ratings for Furnaces by Mike Rampey | November 10, 2011November 10, 2011 Furnace efficiency is defined by the Annual Fuel Utilization Efficiency (AFUE) rating. This rating represents the percentage of energy in the fuel that is converted to usable heat for warming […]Read More Filed Under: Furnaces Tagged With: Broken Arrow– efficiency ratings– furnaces– Tulsa