In hot countries, I try to find an old key that will fit the main switch, so when I leave the room, the AC stays on (I'll still turn off the lights). I played that trick twice this past week: once in Pokhara, and once in Kathmandu, where it gets quite warm during the rainy season, and the AC never seems to catch up once shut off. I figure that the hotel is free to charge me extra... though that has yet to happen.