A furnace works to keep a home warm in the winter and plays a critical part in the operation of an air conditioning system. Furnaces produce heat through the combustion of natural gas, oil or propane in the furnace’s burner. The heat produced from this process then passes through a heat exchanger. Air from your home’s return air ducts is blown over the heat exchanger, thus warming the air. The furnace’s blower then blows the warmed air into the duct-work, which carries and disperses the warmed air throughout the home. During warmer months, the blower inside a furnace continues to circulate return air throughout the home–only this time, the return air has been cooled by being blown over the indoor coil portion of the home’s split-system air conditioning system. The condensing coil is typically installed on top of the furnace. Benefits Indoor warmth any time it is required. Energy efficiency – The efficiency of a furnace can be determined by its AFUE – or Annual Fuel Utilization Efficiency. The minimum efficiency level for furnaces currently manufactured in the U.S. is 80% AFUE. A rating of “80% AFUE” means that for every dollar you spend heating your home; 80 cents are actually applied to the generation of warmth. Compared to many of the 60% AFUE furnaces in older homes, 80% AFUE furnaces are a significant improvement.
Original Youtube video here: Gas Furnace Repair