Annual Fuel Utilization Efficiency. A measure of a gas furnace’s efficiency in converting fuel to energy—the higher the rating, the more efficient the unit.
Gray Duct Heating, Cooling & Air Duct Cleaning
Gray Duct Heating, Cooling & Air Duct Cleaning
Annual Fuel Utilization Efficiency. A measure of a gas furnace’s efficiency in converting fuel to energy—the higher the rating, the more efficient the unit.