When the temperature drops in Queensland, many of us reach for the heater without thinking twice. But a lot of what gets passed around as ‘good advice’ for winter heating is myth, not fact. Whether it’s cranking the thermostat, turning the system off when you leave, or relying on a cheap fan heater, these habits often backfire – costing more to run and leaving the house colder than it needs to be. Let’s cut through the noise and look at the most persistent winter heating myths Australia homeowners fall for every year, and what actually works in a Queensland winter.
Myth 1: Cranking the Thermostat Heats the Room Faster
This is probably the most common mistake. You walk into a cold room, twist the dial or jab the remote to 28°C, expecting the room to warm up quicker. But reverse cycle air conditioners (and most heat pumps) work at a constant rate regardless of set temperature. The thermostat only tells the unit when to stop heating – not how fast it gets there. Setting it higher than your target doesn’t make the compressor run faster; it just means the system will keep running past your comfort point, wasting power and often overheating the room. The correct approach: set the thermostat to your desired temperature (typically 20–22°C for winter) and let the inverter do its job. It’ll reach that temp as quickly as it would any other setting.
Myth 2: Small Portable Heaters Are Cheaper Than Reverse Cycle
Many Queenslanders keep a little oil column heater or fan heater under the desk, thinking it’s more efficient than firing up the main split system. In reality, the reverse cycle air conditioner has a massive efficiency advantage – for every kilowatt of electricity it uses, it moves 3 to 5 kilowatts of heat into the room. An old-school resistive heater (like a bar radiator or fan heater) converts 1 kW of electricity into 1 kW of heat – no more. So to heat the same space, a portable heater can cost two to three times more per hour. The only time a portable might win is if you’re heating a single-person workspace in an already warm house, and the reverse cycle would be overkill. But for a typical living area, the split system is far cheaper to run. If you’re worried about energy use, check the COP (coefficient of performance) rating on your unit – anything above 3 is excellent.
But what about those ‘quieter’ oil heaters?
Oil-filled column heaters are indeed quieter than fan heaters, but they’re still resistive. They also take longer to warm up, so you tend to leave them on longer. Meanwhile your reverse cycle system can recieve the room to temperature in minutes. Don’t let the silence fool you into thinking it’s saving you money.
Myth 3: You Should Turn the System Off Completely When You Leave for the Day
This one’s tricky – turning things off when not in use is usually good advice, but with heat pumps it’s not that simple. If you switch your reverse cycle system off every morning and come back to a freezing house at 5pm, the system has to work hardest during the expensive evening electricity peak to bring the temperature up from, say, 10°C to 21°C. That recovery burst uses a lot of power. A better strategy is to set a timer or use a thermostat setback – let the system maintain a lower temperature (say 15–16°C) during the day, then bump it up an hour before you get home. The unit runs less overall, and it never has to fight a huge temperature difference. Most modern air conditioners have a smart timer or Wi‑Fi control that makes this easy. It’s the same logic as keeping a car engine warm – you don’t let it freeze solid if you’re coming back in four hours.
Myth 4: Ceiling Fans Are Useless in Winter
Some people think fans are only for summer, but a ceiling fan running in reverse (clockwise, low speed) gently pushes warm air that has risen to the ceiling back down into the living space. In Queensland houses with standard 2.4m ceilings, heat stratification can cause a 3–4°C difference between floor and ceiling. Without a fan, your thermostat reads the temperature near the ceiling, so it may think the room is warm enough while your feet are cold. Running the fan on low in reverse mode improves comfort and can let you lower the thermostat by 1–2°C, which saves around 5–10% on heating costs. It’s like having a ‘roo in your veggie patch – you need the right fence, not a bigger gun.
Myth 5: Ducted Heating Is Always More Expensive Than Split Systems
This depends entirely on the house layout and usage patterns. A ducted reverse cycle system with zoning can actually be very efficient if you only heat the rooms you’re using. In a large family home, running two or three split systems at the same time can collectively use more power than a single ducted unit running one zone. Plus, ducted systems often have better filtration and a more even temperature distribution. The real cost driver is the condition of the ductwork: leaks in the ducts can waste 20–30% of the heated air, so if you have a ducted system, get it checked. AS/NZS 5149 says any refrigerant work must be done by an ARC‑tick licensed technician, but duct sealing is a job for a specialist insulation contractor. Don’t write off ducted heating just because someone told you splits are always cheaper – run the numbers for your specific house.
Heat Smart This Winter
The common thread in all these winter heating myths Australia homeowners believe is that they’re based on intuition, not thermodynamics. A reverse cycle system works best when you leave it to regulate, set it to a comfortable temperature (not a beach holiday), and manage the whole house air movement.
If you’re unsure about your system’s performance or want to check that everything is running safely and efficiently, it’s worth getting a qualified technician to give it a once‑over – especially if it hasn’t been serviced since last winter. For homeowners in Brisbane, calling a local pro can save you more in running costs than the call‑out fee. If you’re in Brisbane and need a qualified technician, get a free quote through the site and they can check your system, clean the filters, and verify the refrigerant charge.
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