I have a 38 foot class A, 2 A/C's and I'm stuck in S.E. GA with temps pushing 100 and heat index around 10-15 degrees higher (in short I melt).
I also have two feline fur kids.
I run the bigger A/C 27x7 fan on high
I sometimes shut the smaller one off at night but have recently changed it from HIGH to Automatic... The way my rig is ventelated this has advantages.
But the rear one has been running constantly, save when we have power fails for several months now... (power fails, we have had two this year, 3 last year, unplanned, and 2 each month that last precisely 3 minutes (Can you say generator exercise).