In the ACT, perhaps elsewhere, the OC can pass a special resolution to no longer maintain some aspect of the common property so long as it would not be detrimental to safety or the appearance of the units plan. So, here at least, it would be possible for the rest of the owners to resolve to not maintain the air conditioner that only serves one unit.
That said, there might be an argument the other way which might claim that such a resolution was an example of ‘oppression of the minority’ https://en.wikipedia.org/wiki/Shareholder_oppression