Search the board using your Find in Page function. Use the keyword “Furnace”. There are several posts under “Furnaces and Central Air” posted on 6/30/99. One of them states the following:
You will find a lot of differences in opinion in this one. Here’s mine.

Trane and Lennox are very good. Lennox can be hard to get parts for depending on where you live. Bryant is
cheap version of Carrier. Carrier is OK but not at same level as Trane/Lennox. The J in Janitrol stands for Junk.

I don’t know much about Williamson or ThermoPride.

As far as AC goes, Carrier is a good money maker for service companies. And you get to decide whether
Puron is the coolant of the future or not.
I gamble I wouldn’t take. Don’t let Carrier scare you with the auto AC comparison.

I’d go with Trane. Let the flames begin.

This is only one poster’s opinion. I do believe however that Janitrol is JUNK.