Where To Find Lennox Furnace Model Number

Manufacturers use a two-part numbering system which serves as a guide in identifying the product details like authenticity, size, manufacturing year, etc. It is essential to keep records of your valuables' serial and model numbers for inventory and security. Some people find it hard to locate these numbers, especially for Lennox furnaces. 

Lennox stamps the model numbers and essential product details on its nameplate. Except for gas and oil furnaces, where the data plate is located inside the cabinet, near the vestibule panel. All Lennox products display the model number outside the unit. 

Keep on reading the article to know more about Lennox model numbers and other related topics. We will also be answering some frequently asked questions most furnace owners and buyers have.

Repairing the furnace inside a room, Where To Find Lennox Furnace Model Number

Where Is The Lennox AC & Heat Pump Model Number Located?

Aside from gas and oil furnaces, other Lennox Products have the model number displayed outside the unit. For the Lennox air conditioner and heat pump, the nameplate is mounted on the backside of the outdoor housing cabinet.

A Lennox emblem photographed up close


What Is The Difference Between Lennox Model And Serial Number?

Model numbers identify the type of product manufactured by a company, while serial numbers are a unique set of symbols assigned to individual units within the production run. For Lennox, all air conditioners, heat pumps, and furnaces have the same model number partnered with a set of serial numbers to differentiate each unit further.

How To Decode Lennox Model Number 

Decoding the Lennox model number can be quite complicated since the letters and numbers represent various product details like tonnage, power characteristics, capacity, etc. Moreover, air conditioner and furnace model numbers are read differently. If you're not familiar with the HVAC specifics, this task will be confusing. 

How To Decode Lennox Serial Number 

A serial number is a set of letters and digits assigned to a unit which translates to its manufacturing year and location. Understanding the serial number's underlying meaning can help you make the right decisions regarding your furnace maintenance and replacement. Let's dive deeper into how to interpret or read these serial numbers:

Type I

Lennox's current serial number system consists of 4 numbers followed by a letter. The first two digits represent the factory location, the second 2 digits for the production year, and the letter for its month. Letters A-M, except for I, stands for the twelve months, wherein A is January, B is February, etc.

Example: 6303B45678

You can translate this serial number as "Lennox factory 50-made, last February 2003".

Type 2

This serial number consists of only numbers. It has ten digits, with the last four as the production year and week.

Example: 9876542013 We can conclude that Lennox finished the product in the middle of March, week 13, the year 2020.

Type 3

This type has nine characters in the following order:1 letter, 5 Numbers, and 3 Letters. The first two digits are the production year, in contrast to type 1, the factory location, and the second to the last letter is the month.

Example: E21698XGZ

The first two digits, 21, and the second to the last letter, G, imply that the manufacturing date was July 2021.

Type 4

This example might be the most complicated and longest since it has: two numbers, a letter, two numbers, two letters, and three digits. Moreover, this is the only model number that includes the manufacturing day. 

The first two digits are the assembly day, the letter, same as the others, is the month, and the second set of two digits are the year but in reverse order.

Example: 09D51AX999

When decoded, it means the production date of the item was last April 09, 2015.

Now that you know how to decode the Lennox model and serial numbers, you can quickly determine basic information about your unit. If still in doubt, consult with a professional for a clear overview of the product details.

How Long Does A Lennox Furnace Last?

A gray furnace inside the basement

Lennox furnaces and heat pumps average useful life of 15-20 years. This lifespan is not definite because various factors like climate and maintenance may affect your unit's life span. 

Furnaces near their end usually show deterioration before it finally gives out. The most common hint is a decrease in efficiency; if it takes longer to heat your room than before, you should consider investing in a new one despite regular maintenance. 

What Is the Average Cost of a Lennox Furnace?

For the unit alone, a new Lennox furnace can cost you $1,100- $2,40o. Lennox offers three kinds of furnaces with varying levels of efficiency [AFUE%] to cater to consumers' needs.

What Are The Three Classes of Lennox Furnaces?

The Merit

This furnace line offers 80-90% AFUE, perfect for states with moderate winters, like Kansas. Despite the outside temperature, it consistently warms up your room with the maximum heat.

The Elite

The elite boasts comfort and smart energy use with its 90% AFUE. It combines variable-speed airflow and two-stage heating resulting in a more stable temperature.

The Dave Lennox Signature 

This series is considered one of the best furnace brands to install due to its excellent wide-range AFUE rating of 80%-98.7%. It evenly distributes heat throughout your home and is designed to run at variable speeds to minimize noise production.

Keep in mind that the price range stated above excludes labor costs. Depending on your area,  you may incur an additional $2,500-$4,500 expense for its installation. A simple rule of thumb is that as the efficiency and area increase, so does the cost.

Frequently Asked Questions About Setting Up A Furnace

Technician checking the system of the Furnace

Is It Better To Undersize or Oversize Your Furnace?

Nothing beats an accurate-sized furnace; under-sizing or oversizing any equipment will only lead to wasted energy and higher bills. Your furnace needs to reach a stable temperature before eventually shutting off. Worst case scenario- off-sized furnaces will either consistently run or undergo short cycling due to their inability to achieve peak performance.

Undersized furnaces will operate longer and harder, especially during winter, to maintain warmth throughout your home. There might even be a chance it won't reach the set temperature.

On the other hand, oversized furnaces operate in short bursts resulting in overheating and shutting down. It will then try again to achieve consistent temperature but eventually fail,  thus entering the stage of short cycling.

It is best to seek out the advice of HVAC experts to determine the most compatible and economical fit for your home. We suggest hiring professionals affiliated with your furnace brand for optimal results.

What Is The Ideal Location For A Furnace?

There is no common area for furnaces since different structures require unique needs and factors. Nevertheless, architects and contractors usually incorporate furnace spaces in their designs.

What Are The Factors To Consider When Choosing Furnace Location?

  • Ventilation- ensure fresh air circulation in your preferred furnace spot. 
  • Lay out- unit should physically fit the room and have enough space for contractors to work around the furnace if needed.
  • Power- there should be a stable flow of electricity or an existing gas line for your furnace to operate smoothly.
  • Furnace vent- if no pre-existing vent is readily available, your room must meet the requirements for a technician to install this type of unit.

Where Are Furnaces Commonly Installed?

  • Laundry room- provided that it has a large area. You should have adequate space for other heat-generating appliances like washers and dryers; this is also a suitable place for furnaces.
  • Garage- new buildings often have hidden rooms to hide the furnace and retain the original size of the garage
  • Attic & utility room- this is often the last resort and is mainly used by homeowners with limited space.
  • Basement- considered the perfect place for furnaces due to their being spacious, hidden from public view, and having steady airflow. Place it on higher ground to protect it from flooding.

Improperly installed furnaces can cause carbon monoxide and gas backdraft, which is dangerous to your health and home. For safety reasons, hire a professional for your furnace installation.

In Closing

Repairing the furnace inside a room

Lennox's model and serial numbers presentation may have changed throughout the years, but its content remains the same. Familiarity with your furnace characteristics can be beneficial in addressing common concerns.

You can quickly fix some furnace issues with a simple DIY and research, but we highly recommend contacting an HVAC professional. Their expertise can help you prolong your unit's useful life and ensure efficient operation all year round.

If you found this article helpful, check out some of our other helpful articles!

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