hvacrmedic wrote:

There is no difference in the motors. It's the control systems
that are different.

What -

On
Off

What else do you need for a control system?

Quoting a salespitch isn't the equivalent of enlightenment.
You didn't even know that the thing existed until a few minutes ago.

I've known about ECM motors for some time.

In fact you thought (very wrongly) that you could throw a
standard ECM motor into any old unit.

What is a "standard" ECM motor?

I know that there are drop-in ECM motors - even if they have
dip-switches to set their operation in the absence of a control
signal.

The Evergreen unit isin't the only drop-in replacement.