If you live in United States, there are a number of benefits in knowing how to use your heating system’s serial number. First, it tells you in what year the furnace was manufactured, so you can supply that information when you need furnace repair or maintenance. Knowing your system’s age is important because it can tell you a lot about whether you might be able to get by with furnace repairs; or be forced to completely replace the heating system with a new one.
The most popular furnaces that have many years in the field include Trane, Carrier, Rheem, Bryant, Lennox, Coleman and Goodman. Each of these brands have their own methods of identifying system age from serial numbers.
Most Lennox furnaces have an useful and safe life between 15 and 20 years. Knowing your furnace system’s age is also important when it comes to the issue of connecting it to an air conditioning system. Most people don’t know that if you want to add air conditioning to your home, your furnace has to be compatible with the new air conditioning system.
There are two components to an air conditioning system: the cooling coil or indoor component, and the big gray or green outdoor unit, called a condenser. If you have an older furnace, it most likely won’t be compatible with the newer coil, and subsequently, the newer outdoor air conditioning condenser.
Today’s Lennox air conditioning systems provide super high energy efficiency - but they won’t deliver these kinds of energy savings when paired with furnaces that use older and outdated technologies.
Lennox Model and Serial Number Location
Finding the serial number on your Lennox furnace may differ from these general guidelines, but be patient - it might take a little foraging to find it. Try these tips first:
Remove the metal door on the exterior of your Lennox furnace. You’ll usually find this along the bottom part attached to the front of the unit. Inspect the interior of the metal door - you might see a a label or tag with the furnace’s serial number. If you’re lucky, it could also show the actual date of manufacturer.
If you can’t find the serial number or date of manufacture, switch off the furnace’s power and view the fan and its blades. If you have an older furnace, they sometimes had serial numbers stamped into the metal of the fan itself.
Lennox Model and Serial Number Nomenclature
To identify the make, model, age, and size you will need to find the Lennox Model and Serial Number. Do this on the outdoor unit, whether it’s a split system or package system. On a package system it is usually on the right side of the equipment, near where the gas and power connect to the system.
On a split system the label is often found on the same side as the refrigerant lines enter the system. On some older systems near the bottom right above the lines on newer systems closer to the top.
On this label you’ll find Lennox Model and Serial Number. The ones we are most interested in are the model and serial numbers. From these we can determine the age, size, and type of equipment.