In Victoria at least (not sure about WA), air cons not working are considered urgent repairs.

It’s very likely the same in WA; I haven’t looked into it. Which I regret now, as the landlady took ages (over a year) to approve an Aircon repair in our old house.

This topic sort-of skirts around the issue of solar panels in WA. They’re very common among home owners, but rare among renters. You can almost tell whether a house is owned or rented here by looking at solar panels in the street. Landlords have zero incentive to install them, because they cost a decent amount and don’t change the amount in rent by very much and then they’re on the hook for repairs/maintenance of them.