The most common systems purchased by people in need of professional air conditioning installation Sydney are: • Portable AC units- these are versatile and they are popular because they can be placed pretty much anywhere you want as long as you have a power outlet. These are suitable for small rooms and their installation is simple. • Split systems- such a system has a head unit and a condenser. Its installation is quite affordable • Ducted systems- these are designed for the heating and cooling of the whole house or a larger space; they cost more than other types of systems and their installation is also more expensive.