The company muttered last year about any bills over 21,600 per year being reclaimed via salary deduction. However, I don't think anybody actually got charged for going over the limit. The threat remains though.
It is an unfair cap as the company housing stock is hugely variable in size and age. The newer buildings are better insulated and presumably the a/c units are more effective. I imagine some of the 20 year old villas that were never that well built in the first place must be very hard to keep cool.