Can anyone tell me where I can get info on why's of using a variable speed blower to obtain higher eff.
I can understand varying the blower speed if you vary the compressor speed also. In other words, varying the blower speed as the load on the house decreases and your system output decreases.
What i can't seem to grasp is changing the blower speed without changing the unit output load.

My big problem is that when you lower speed, the system runs longer. I can see where comfort could be better, but what about energy eff. if the system runs longer, even at a lower amp draw.