![]() ![]() These numbers in the example are “56”, so the unit was made in 1965. Year: The 4 th and 5 th characters indicate the year, in reverse, that the unit was made. The letter is a “B”, so the unit was made in February, based on the Lennox Month of Manufacture code below. Month: The 3 rd character is a letter and indicates the month the unit was made. In this case the numbers are 09, so the 9 th day of the month. The first 2 numbers usually indicate the factory where the unit was made and are not used in decoding the manufacture date.ĭay: The 1 st and 2 nd characters represent the day of the month the unit was made. Style # 1 is the most common style and always begins with 4 numbers, followed by one letter, and ends with 5 more numbers. Style #1: 10 Characters – Numbers and One Letter – 1974 to Present The other numbers and letters identify the plant where the unit was made and the sequence of manufacture. In each of these examples, the characters that indicate the manufacture date have been underlined. ![]() How to Read a Lennox Serial Number – Details They contain the serial number, which might be written “Serial #” or “S/N,” and they contain other specs like voltage. On Lennox air conditioners, heat pumps and mini-splits, look for the rating plate on the exterior of the unit near the service panel. On a Lennox boiler you can find the rating plate on the exterior at the top of the unit. The rating plate is often placed on the left side of the cabinet, although the type of furnace you have may impact the exact placement. On a Lennox furnace, you will find the rating plate by removing the top, front, service panel. You can find the serial number on the rating or data plate, sometimes called a rating or data tag. You may also like: SEER of 20-year Old ACs (+5 Features Your Aged AC Doesn’t Have) Where is the Lennox Serial Number? These aren’t model numbers: This post is about Lennox serial numbers, not Lennox model numbers that have nomenclature related to series, capacity, and performance of Lennox HVAC equipment. These serial numbers date back to the 1960’s but the current style has been used since 1974 on all Lennox HVAC equipment making serial number lookup and easy task. In total, Lennox has used 4 different styles of serial numbers on their furnaces, boilers, heat pumps, air handlers, AC units, and mini-splits. This Lennox serial number lookup works for the Lennox age of unit lookup on air conditioners, heat pumps, gas furnaces, air handlers, boilers and mini split ductless heat pumps. Interested in Replacing Your Lennox HVAC Unit?.Style #3: 10 Characters – Numbers and Letters – 1960s and 1970s.Style # 2: 9 Characters – Letters & Numbers – Late 1970s to Early 1990s.Style #1: 10 Characters – Numbers and One Letter – 1974 to Present.How to Read a Lennox Serial Number – Details. ![]()
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