I have worked in the Riu GC and its a great hotel. The staff are brilliant and the food is even better! Even though you're all inclusive, make sure you try some of the restaurants in Meloneras.
The air con just means that its controlled at a central point, rather than in your room, so the management basically say when its on. Saying that, I wouldnt worry because in August it should be on most of the day and night.
I have just booked to go to this hotel in May, got a good deal by booking room only with travel agent and our own flights. Has anyone stayed here recently please. Any comments appreciated.