Janitrol began in 1930 and initially manufactured air ducts as part of their HVAC contractor business.  Eventually the company produced their own line of residential and commercial furnaces, heat pumps, and air conditioners.  Janitrol was purchased in 1982 by Goodman Manufacturing Co. and the brand continued to be produced until 1992.  Goodman was acquired by Daikin Industries in 2012. 

Janitrol replacement parts are still available through online retailers.