I'm for leaving AC units off. Do you have 30 or 50 amps and do you know what the voltage is like when you're away? If it's on the low side near 105 volts at times, that will lead to damage to AC units. If you're 30 amps, running 2 AC units is inviting trouble even if you have good voltage. It can't really take that long to cool down? If it even does much anyway if really hot out... :(
Folks leave fridges running all the time on electric when parked. Have you ever inspected the fridge burner or had a tech do it? They can deteriorate or get fouled up.
I anything, do NOT leave water turned on!