Go to the outside cabinet of the air conditioning system. ![]() One may also ask, how old is my Lennox HVAC? The date of production/manufacture or age of Lennox® HVAC equipment can be determined from the serial number located on the data plate. "5498L" will give you the place, year and month of manufacture for the Lennox air conditioning unit. Use the serial number 5498L9988 for an example. Write down the first five digits of the Serial Number. Keeping this in consideration, how can I tell how old my Lennox furnace is?įind the series of numbers and the letter that follow the word "Serial" on the identification plate. How can I tell the age of a Lennox heat pump or air conditioner from the serial number? The second two digits of the serial number are the year of manufacture for Lennox units.
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