Keeping cool

Four Winds Guy wrote:
How do other Class C owners stay cool in the hot summer months?

Do you drive with generator on and air conditioner running? Or do you use the engine air conditioning on the road with generator off, and open the vents to release hot air when you stop?

And does starting the A/C plugged in at a campsite with the roof vents open speed up the cooldown?

We're returning to RVing after 10 years and trying to re-learn all the tricks. Once we plug in at a campsite and turn on the A/C high, it takes a while to get cool, but if we forget to turn it down, we'll be popsicles in the morning.

We just use the dash air set to a reasonable temp like 20C (sorry Euro-thermostat), start if off on "recirculate", and close all the roof vents and windows. It seems pointless and self defeating to cool the interior air and then suck it out through open vents. When we leave the coach parked to run errands, we might fire up the generator and start the roof air to keep things cool while we're shopping or whatever. Of course, we try to be as far away from humanity as possible, if we choose this option, to reduce the "audible" annoyance.
We were just out this afternoon/evening, and this methodology worked very well.