your right to install aircon has been established in court.
I wonder if that covers owners “right” to cause a brown-out or complete system failure if the power demands exceed the capacity to supply. Our block won awards for its design, including cross-flow ventilation and limited air-con, and as a result has an inadequate transformer which would not cope with maximum demand if everyone had air-con at the same time (which they would have because the weather is the same for everyone in the building).