Affinity is the high-efficiency HVAC brand of York International, a division of Johnson Controls. The second and fourth digits of the serial number, taken together, are the year of manufacture of the unit. So the serial number on the data plate of an Affinity series heat pump condenser shown below indicates it was manufactured in 2011. 

    For the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner? 

    Also, see our blog post How many tons is my Affinity air conditioner or heat pump?  For the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner?

     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)? 

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Field Guide for Home Inspectors, a quick reference for finding the age of 154 brands of HVAC systems, water heaters, and electrical panels, plus 210 code standards for site-built and manufactured homes, and the life expectancy rating of 195 home components. Available at amazon.com for $19.95.
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  To learn more about heating and air conditioning systems, see these other blog posts: 

• My air conditioner won't turn on. What's wrong? 

 • 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.