Dont know about that - any time i'm in a hotel the Aircon gets set at 18c and that does me fine. I guess being from north of the border i'm used to slightly cooler climes, but in my view it's easier for people who find it too cool to wrap up warm with extra clothes/blankets, but it's impossible to get cooler when trying to sleep on a plane (and you cant exactly do what you would do at home and sleep in your birthday suit).

I think they should keep the interior of the aircraft around 18-19c - i'm sure i'm not the only one who gets off a flight feeling like they need a shower because it's been so hot and sweaty on the aircraft.