How to Read Lennox Model Number

The Lennox model number is an important instrument in determining the right replacement part for a specific model. All Lennox product is build with a systematic coding system for both model and serial numbers. The series of letters and digits in the Lennox model number reflects particular information relating to the product.

Lennox uses this number as a guide for identifying the age, size and warranty information. Identifying Lennox model number and serial numbers will help in choosing the right parts for these products.

Lennox Model Number Location

Each Lennox HVAC units manufactured is a duplication from some particular model. The model is determined by a “model number” which is usually located on the unit data plate or rating plate. On residential gas and oil furnaces this data plate is located on the inside of cabinet near the main panel. Accessing the Lennox model number may requires remove and set aside your furnace’s front door.

On other Lennox products the data plate is mounted on the outside of your unit.

How to Determine Lennox AC Tonnage from Model Number?

Tonnage refers to the cooling capacity of an air conditioner. Tonnage is measured in BTUs (British Thermal Units.) One ton of cooling is based on the amount of heat needed to melt one ton (2000 lbs.) of ice in a 24 hour period. One ton of cooling is equal to 12,000 Btu/hr.

Here the numbers matching tonnage:

  • 18 = 1.5 tons
  • 24 = 2 tons
  • 30 = 2.5 tons
  • 36 = 3 tons
  • 42 = 3.5 tons
  • 48 = 4 tons
  • 60 = 5 tons

Basically all HVAC manufacturers encode the size or tonnage of their systems into the model number. Tonnage is most important to consumers as it can be used to determine the size of air conditioning. The size of Lennox AC unit is reflected in these model numbers.

Size is very important to the proper operational status of an Air Conditioning System. If you are unable to read the Lennox model number you can look down into the condensing unit from the top to see the compressor and often use the compressor part number to determine the AC tonnage.

Lennox Model Number Nomenclature

Lennox Model Number Nomenclature in AC/HeatPump

When it comes to Lennox model number breakdown, you must be very careful. Many homeowners having trouble translating the model number in Lennox AC/Furnace. Take a look at our example below:

#HS26-060-1P
HS26 is the Series, 060 is the Capacity, 1P (1) is the Dash Number and (P) is the Power Characteristics.

#GCS16-090-350-2Y
GCS16 is the Series, 090 is the Cooling Capacity, 350 is the Heating Capacity, 2Y (2) is the Dash Number and (Y) is the Power Characteristics.

#G14-100
Gas heating unit, series 14, 100,000 Btuh input.

#G14Q3-80
Gas heating unit, series 14, direct drive blower for 3 tons of cooling, 80,000 Btuh input.

#G12Q3E-110
Gas heating unit, series 12 direct drive blower for 3 tons of cooling electronic ignition, 110,000 Btuh input.

Lennox Model Number Nomenclature in Furnace

#HS18-261-7P
Condensing unit, series 18, approximately 26,000 cooling capacity (2 tons), single phase power.

#HS19-311-1P
Condensing unit, series 19, approximately 31,000 Btuh cooling capacity (2-1/2 tons), single-phase power, expansion valve unit.

#HP19-511-1Y
Heat pump unit, series 19, approximately 51,000 Btuh heating and cooling capacity (4 tons), three phase power, expansion valve unit.

#C16-41-1FF
Evaporator coil, up-up-flow, series 16, approximately 41,000 Btuh cooling capacity (3 tons).

#CHA15-261-1P
Single package air conditioner, series 15, approximately 26,000 Btuh cooling capacity (2 tons), single-phase power.

Lennox model number styles may have changed year after year but their basic breakdown is consistent for some character. If you have any issues with finding Lennox model number or determining the age of Lennox unit, contact the HVAC professionals. They would be pleased to help you get the information you need and make sure you get the right advise for your system.

About Mas Broto

Have been in the heating and air conditioning (HVAC) industry for over 20 years. He is person that will grow and thrive to learn more about the HVAC industry throughout his career. Mas Broto is also a blogger, who's dedicated to bringing you the best knowledge to get ahead in the game of life.