How good is goodman furnaces and central air conditioning?

I have had no problems what so ever,although some in here will dissagree
The main and most important thing is to make sure the installer knows what he is doing and doesn`t try to cut corners
For the money they are as good as any,and better than some

They are a decent mid grade... better than some but not the best.

Once school of thought says that since there are many common parts (e.g, compressors, switches, sensors) there is very little difference from one to another.