I think what you really want is to set M143 to turn off the chamber heater when it gets to the set temperature.
Yes, this is exactly what i want to do and kind of what i figured was going on once i started setting my chamber temperature to 30C instead of 40C.
How do you set the chamber temperature currently?
Typically in the slicer
So what you said makes sense and was what I was going to test next, just lowering the S parameter value of M143.
Thank you for this info.