The Janitrol brand was manufactured by Goodman Manufacturing Company from 1982 to the mid-1990s. The serial number system was the same as for Goodman systems, which is that the first two numbers are the year of manufacture. The data plate on the side of the unit also had Goodman Manufacturing listed at the top. The example below indicates that the air conditioning condenser was manufactured in 1991. For the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner?

    To find the size of a Janitrol unit, go to What size in tons is a Janitrol air conditioner or heat pump from the model number?  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 determine other key specs of your HVAC system, see one of these other blog posts: 

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

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

    To find the age of other home components, go to How can I find out the age of a roof? and How do I determine the age of an electrical panel? and How do I determine the age of my water heater? For life expectancies, visit What is the average life expectancy of the components of a house?

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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? 

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

• 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.