How to find your furnace model number

Furnace model and serial numbers are posted on the inside or outside of the furnace on a sticker or metal nameplate. The location varies by manufacturer:

Lennox furnaces

Find the model number and serial number for Lennox furnaces inside the top cabinet, on either the left side or on the blower deck (the metal panel separating the top and bottom of the furnace). To access the top cabinet, remove the top-front service panel.

Trane furnaces

Find the model number and serial number for Trane furnaces on the outside, on the right or left panel.

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