Can I install an air-conditioner?
The answer is maybe. The Strata Schemes Management Act 2015 provides for minor renovations subject to approval by the owners corporation in general meeting (see section 110 of the Act which deals with minor works and Clause 28 of the Strata Scheme Management Regulations 2016 which includes reverse cycle split system air conditioner in the definition of minor renovation works).
If you intend or want to install air-conditioning first check the By-laws of your Strata Scheme. If they provide for air-conditioning installation following the provisions of the By-law.
If you make an application to the owners corporation, provide as much information as is possible including proper plans and specifications of the proposed installation work including what use of or interference to common property will be required. Specifications relating to the proposed unit are important especially relating to the type, rating, mechanical specifications, brand, noise, water discharge and appearance. Most schemes want external air-conditioning hidden from view on balconies or in car spaces.