mindless is when people just look up "speed controller" and post a bunch of links, none that are relevant usually.
That Guide to put a controller in is nice, but not anything to do with what I want - to have a controller that uses less energy at lower speeds.
I have my controller feeding the FF, so have control on a wall, not at the fan. I can always put controller at max and run the FF normally. I set FF on High and control the speed by using the controller.
The PWM things have big heat sinks, so are producing heat. IDK beyond that, so am asking any electrical geeks out there who might know