The question here is whether or not having communal air conditioning repaired and maintained is more expensive than having individual units. 75 percent of owners will have to approve this change so it’s not something that will pass on a whim. If the motion fails, the Owners Corporation (and that includes you) will have to pay to have the air-con repaired. But if that’s what you really want, make sure you have organised enough votes to reject the motion at the AGM.