One must admire the creativity that comes alive within a landlords' brain, once his greed buttons are switched on. I've got several friends right now, suffering from a new landlord sickness, the "chiller fever".
During the rental term they have a received an invoice from their landlord (without further explanation), saying that although the AC was free in the building, they now decided to start charging for the chiller. Cheapest chiller fees for a 1 bedroom start at 3600 AED a year. I find that unbelievable. The rent committee didn't comment and seems is not interested to follow up on such "small" issues.
I say - cool idea landlords, easy way to make an extra couple of hundred thousand dirhams a year with no extra effort! No honestly, I hope you choke on the money.