![]() THE AVERAGE FURNACE LIFESPAN A well-maintained furnace can last at least 15 to 20 years, but completing annual maintenance and being diligent with repairs can extend its life even longer. What is the typical lifespan of a furnace? … Today, our products are still proudly assembled in the United States under the Allied Air name. In 1928, Lennox Furnace Company-one of America’s leading manufacturing interests-created Armstrong Furnace in Columbus, Ohio. 28 How long has Lennox HVAC been in business?Ī proud heritage of American quality.26 Who manufactures Goodman air conditioners?.19 Should I cover AC condenser in winter?.18 What size furnace do I need for a 2000 square-foot home?.17 What size of furnace do I need for a 1500 square-foot house?. ![]() 16 How much does a furnace cost for a 1500 square-foot house?. ![]()
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