A horizontal flow furnace refers to the direction in which heated air leaves the furnace and enters your ductwork so that it can be dispersed through your home. Furnaces can also have upflow or downflow, but the advantage of horizontal flow furnaces is that they can be placed on their side. Your technician may decide that based on where you are installing the unit, it may make more sense to go with this option.
Annual Fuel Utilization Efficiency (AFUE) measures how efficiently a furnace converts fuel to energy. The higher the AFUE rating, the more efficient the furnace.
Furnaces are a whole-home heating solution that work by burning a fuel source, like natural gas or propane, to make heat. The heat produced is combined with cold air from your home, then is re-distributed via ductwork to increase indoor temperature.
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