[masraum]

Originally Posted by cabmando

Not quite. An oversized unit would cool the space faster than it can remove humidity. You'd end up with a cold humid space. Would go back to what Redbeard was talking about with short cycling.
https://energyair.com/signs-ac-system-large/

BTW, In my old house my (by old I mean age. I still live here) 2nd floor will be a bit colder than the first floor. I sized the ductwork to the second floor to handle cooling load. I have to shut the registers off almost completely in the winter.

Point taken. I do remember reading about how for them to be most efficient, they have to run at least X long (5 mins or 10 mins, I think, can't remember which).