How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
How do I tell the age of a Grandaire air conditioner or furnace from the serial number?
Wednesday, July 18, 2018
The fourth and fifth digits of the serial number are the year of manufacture. The data plate shown below, with the serial number GS3001002827, indicates that the unit was manufactured in 2000. 
To find out the age of another brand of air conditioner or heat pump, go to How do I determine the age of my air conditioner? Also, see our blog posts How many tons is my Grandaire air conditioner or heat pump?
And to figure out what all the other numbers listed on the condenser data plate mean, go to our blog post How do I understand the air conditioner or heat pump condenser label (data plate)?
To learn more about heating and air conditioning systems, see these other blog posts:
• My air conditioner won't turn on. What's wrong?
• How can I find out the size of my air conditioner?
• Where is the air filter for my central air conditioner and furnace? I can’t find it?
• Does an old air conditioner use more electricity as it ages?
• How did homes stay cool in Florida before air conditioning?
• What is wrong with an air conditioner when the air flow out of the vents is low?
• Why has the thermostat screen gone blank?
• Why does it take so long to cool a house when an air conditioner has been off for a while?
• Why is my air conditioner not cooling enough?
• What are the most common problems with wall/window air conditioners?
• Will closing doors reduce my heating and cooling costs?
Visit our HEATING AND AIR CONDITIONING page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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