Air conditioning myths that are costing Australians money
5 December, 2025
Key Takeaway
Many common beliefs about how to use an air conditioner are outdated or incorrect. Myths like leaving the air con on all day, closing vents to save power or blasting it at the lowest temperature often lead to higher energy bills and less comfort.
Air conditioning habits are usually passed down from family or friends, not from experts. As a result, many Australians run their systems in ways that waste energy without realising it. Here are the most common myths and the truth behind them.
Myth 1. Setting the temperature very low cools the house faster
Setting the temperature to 16 degrees does not cool your home faster. The system will run at the same speed no matter what number you choose. All you are doing is causing the system to run longer than required, using more electricity.
A smaller change such as 24 to 25 degrees achieves comfortable cooling with less energy use.
Myth 2. Turning the air con on and off quickly saves energy
Rapid cycling puts strain on the system and can increase running costs. The system works harder each time it restarts. A steady, moderate cycle is far more efficient.
Smart sensors prevent short cycling by reading the temperature in the rooms you actually use.
Myth 3. The thermostat on the wall reflects the temperature in every room
Hallway thermostats are often the least accurate place to measure comfort.
They can be hotter, colder or draftier than the rooms you spend time in. This causes the system to run for longer than needed.
Room based sensors give a much clearer picture of real living conditions and prevent overrunning.
Myth 4. Bigger systems are always better
Oversized systems cool quickly but shut off before humidity is removed. This leads to clammy indoor air and higher running costs. Oversized units also cycle more often, wasting energy.
A smaller, correctly sized system paired with smart zoning is often more efficient.
Myth 5. You must cool the whole house at once
Cooling every room is one of the fastest ways to increase your power bill. Most families only occupy one or two zones at a time. Directing airflow to the rooms you are using keeps comfort high and costs low.
Learn how MyPlaceIQ can save you up to 46% on air-con running costs. MyPlaceIQ is a super smart air-conditioning system that integrates with a range of smart home products that increase your comfort, control and most importantly reduces your energy bill.
