To find the correct document, please look at the document’s published date. 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. Please note that the 4th and 5th digits of your serial number indicate the year and the 6th and 7th digits indicate the month. Will closing doors reduce my heating and cooling costs?.What are the most common problems with wall/window air conditioners?.Why is my air conditioner not cooling enough?.Why does it take so long to cool a house when an air conditioner has been off for a while?.Why has the thermostat screen gone blank?.What is wrong with an air conditioner when the air flow out of the vents is low?.How did homes stay cool in Florida before air conditioning?.Does an old air conditioner use more electricity as it ages?.Systems: Eight (8) character serial number beginning with letters from M to Z. CAUTION: Canada units reverse the Year and Month positions from U.S. Where is the air filter for my central air conditioner and furnace? I can’t find it? The serial number style was used exclusively from 1980-1984 and ONLY used letters M through Z to represent the month.To learn more about heating and air conditioning systems, see these other blog posts: How can I find out the size of my air conditioner?.How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump?.How can I find out the SEER of my air conditioner?.To determine other key specs of your HVAC system, see one of these other blog posts: Intertek ETL Inter-City Products Janitrolįield 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. Find your brand in the list below and click on it to go to the page with specific instructions for determining when your unit was produced, with actual data plate examples.Īffinity Airdach Aire-Flo Airquest AirTempįedders First Co. Sometimes it’s the first two numbers, or second two numbers, or second and fourth, or even a letter code. Go to the outside unit (condenser) and look for the metal plate or sticker on the side with the manufacturer’s data.
The date of manufacture is encoded in the serial number on the data plate of almost all air conditioners.