The cost of installing a split system air conditioner costs between $500 – $2000, depending on a range of factors such as accessing the area for the external unit, the model and brand to be installed, and how many split system air conditioners you will need to be installed as the cost per unit decreases if more than one ...

The size of air conditioner required will depend on the size of the house, the amount of glass in the home and the insulation throughout the house. Savage Air Pty Ltd will work with you in order to ensure it is sized correctly and is most energy efficient.

It's common for an air conditioning system to use 3,500 watts, so let's roll with that and the average national kWh cost – that's 13.2 cents – to get an idea of a rough average running cost. Let's also assume that you're running the unit for eight hours per day. This setup will cost you $3.70 per day to run.

The cost for a typical gas ducted heating system including installation will range between $2,500 – $10,000 depending on the rating and kilowatt capacity of the unit and number of heat vent outlet points.

According to the Sustainability Victoria website, to heat an average sized house of about 170 square metres will cost approximately $1,055 per year with a 3.5 star energy rated gas ducted heating system.