I just took my integrated Setton amplifier out and replaced it with a Primaluna pre and two Emotiva monoblock amps.  I wanted to compare the sound anyway.  The room temp went up 1 degree.  It's not a big room.  But hey, in southern New England every little bit helps, right?  Wait, the outside temps are in the twenties now and not the single digits.  Hmmm.  I may have to rethink prolonging this test...
Best Regards,
Blu99Zoomer