Every time we come across an ancient Singer HVAC system we say “this has got to be the last one we will ever see." And then another Singer turns up a few months later. Eventually they will all be gone but, in the meantime, here’s the serial number code: look for a single letter in the center of the serial number, which will denote the year of manufacture. We suspect that the adjacent two numbers are the month, but not sure.

    A = 1973, B = 1974, C = 1975, D = 1976, E = 1977, F = 1978, G = 1979, H = 1980, J = 1981, K = 1982. In 1982, it became the climate control division of Snyder General and the name was dropped, although Daikin now owns the brand and manufactures mini-splits under the Singer name in Thailand. So the “F” in the serial number below indicates the unit was manufactured in 1978.

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

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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:

• How can I find out the SEER of my air conditioner? 

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

• How can I find out the size of my air conditioner? 

• How can I find out the age of my air conditioner or furnace?

• How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump? 

• 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.