As the chilly season fast approaches, it is important to ensure that your furnace is in good condition. One way to do that is by knowing the age of your furnace and whether it needs to be replaced or repaired. Unfortunately, many homeowners struggle with knowing the exact age of their furnace, especially if they just purchased a new home. This article will help you identify some quick and easy tips to determine the age of your furnace so that you can make informed decisions about your heating system.

Look for the Furnace’s Serial Number

One of the quickest ways to determine the age of your furnace is by looking at its serial number. Manufacturers usually incorporate the date of manufacture into the serial number. While the format varies between brands, the first four digits usually indicate the year and the week of manufacture. Therefore, if the first four digits are 2213, your furnace was made in the 22nd week of 2013. To know more about the format of your furnace’s serial number, check the manufacturer’s website or manual.

The Furnace’s Installation Date

If you recently bought a home, getting in touch with the previous homeowner to ask about the furnace’s installation date is a quick way to know its age. If you installed the furnace, there’s a chance you kept the warranty or invoice documents that show when it was installed. Checking the documentation can reveal vital information about the furnace’s age and maintenance history.

Check the Furnace Exterior

The furnace’s exterior might have some markings that indicate the installation date. Look for small metal plates, inspection stickers, or other labels that may contain installation or service dates. If you recently had the furnace repaired, the service technician may have left a sticker indicating the date and nature of the service. Whatever markings you find can provide useful hints of your furnace’s age.

Ask For Help from Steve Patrick Air

If you’re still unsure about the age of your furnace or need help inspecting it, contact Steve Patrick Air at 559-224-1729. Our team of highly skilled technicians will inspect your furnace and help you understand its condition accurately. We will also recommend any appropriate repairs or suggest replacement options, depending on your furnace’s age and condition.

Check the Furnace’s Model Number

The furnace’s model number might contain some information about the age of the furnace. While not all manufacturers use this method, it’s worth checking. The model number may contain an encoded date of manufacture that you can easily decode. If you’re unsure, contact your furnace’s manufacturer or HVAC technician to learn more about the model number and its format.


Knowing the age of your furnace can help you budget for repairs or replacements when necessary. By checking the serial number, exterior markings, model number, and installation date, you can accurately determine its age. Always remember to consult an HVAC technician if you’re unsure about your furnace’s age or condition. Call Steve Patrick Air today for more information about our heating repair and replacement services.

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