Pulling warmer outside air in and blowing cooled inside air out seems to defeat the point of having AC. Shutting off the AC after the sun goes down also doesn't allow it to run when it can have its biggest impact.

I had my furnace and AC replaced a couple of years ago. My thermostat is set to reduce the indoor temp just before bedtime. The variable speed DC blower is also set to a 'circulate' mode where it will randomly come on to mix the air in the house periodically, even if the heat or AC isn't actively running, to keep temps more even.

Close registers in the lower areas and open them fully in the upper areas in summer. Reverse in the Winter.

I have a ranch with a full finished basement. The stairwell is open into the basement, so it ends up being pretty cool. My basement is warmest in winter and coolest in summer. I can live with that. ;-)