Nowadays, there are different air conditioning system that you can choose from depending on the number of rooms that you want to cool or other functions of the unit. Window-type models are able to cool a room or open-plan areas for up to 50 square meters. A split-type system can cool one or more rooms or an area of up to 60 square meters. Centralized air conditioning systems will be able to provide cold area to the entire house or building. If a house has several rooms, verify if it will be cheaper to get a separate unit for every room of the house or just go for the centralized air conditioning system.
Reverse-cycle models are not only able to cool the room but can also be used for heating in winter. The difference between the price of this unit and a cooling-only model is not that big and it will be cheaper to get this one rather than getting an air conditioner and a heater.