Wondering what temperature to set air conditioner in winter without blowing up your energy bill? As the chill sets in across Adelaide, homeowners scramble to balance comfort with cost. The good news is you don’t have to choose one over the other.
With smart habits, the right temperature setting, and a little seasonal prep, you can stay toasty all winter – without hurting your wallet or your unit.
This guide explains the ideal winter setpoint, tips for reverse-cycle efficiency, and how to prep your system before the cold fully kicks in.
How Cold Does Adelaide Get in Winter?
Before deciding on the perfect setting, it helps to know: how cold does it get in Adelaide during winter?
The winter months in Adelaide (June to August) have average minimum temperatures between 6°C and 8°C. Some early mornings even dip below 4°C in the outer suburbs.
And while daytime highs hover around 15°C, it can feel much cooler inside without proper heating.
That’s where reverse-cycle air conditioners come in handy.
The Ideal Winter Temperature for Reverse-Cycle Air Conditioners
So, what temperature to set air conditioner in winter for Adelaide homes?
Experts recommend 18°C to 20°C. That’s the good spot for warmth without excess energy usage. Every degree above 20°C can increase heating costs by 5% to 10%, according to Energy.gov.au.
Here’s the breakdown:
- 18°C to 19°C – Best for overnight comfort and consistent use
- 20°C – Ideal for daytime heating in living areas
- 21°C+ – Only when you need a quick warm-up
It might be tempting to crank it to 24°C on cold mornings, but resist. Your unit will work harder, your bills will spike, and the room may overheat.
Instead, give the system time to warm gradually. Use a blanket or put on socks while it kicks in.
Best Practices for Heating in Adelaide Homes
The right setting is just part of the equation. To get the most from your Adelaide ducted air conditioning or split system this winter, try these efficiency tips:
1. Seal Doors and Windows
Gaps in window frames or under doors let warm air escape. Plug drafts with seals or door snakes to lock in heat.
2. Close Unused Rooms
Only heat the spaces you use. Shut doors and vents in guest rooms or hallways to focus airflow where it matters.
3. Use Curtains to Your Advantage
Open curtains during the day to let in sunlight. Close them at night to keep warmth in.
4. Program Your Thermostat
If your system allows it, set timers to warm the house just before you wake or return home – not all day long.
5. Layer Up
Wearing an extra layer can help you stay comfortable at 19°C rather than bumping it to 22°C.
Do You Need a Different Setting for Bedrooms?
For sleeping comfort, what temperature to set air conditioner in winter should be lower than in living areas.
Try 18°C overnight. Your body naturally cools during sleep, and a warmer room can interfere with sleep quality. If you get cold easily, use a heavier blanket instead of cranking the heat.
See also: Corporate Phone 5616220101 Business Customer Line
What About Ducted vs Split Systems?
Whether you have a split unit or Adelaide ducted air conditioning, the same rule applies – keep it between 18°C and 20°C for maximum efficiency.
However, ducted systems often heat larger areas, which means insulation and zoning are even more important.
If your system allows zoning, only heat areas in use. This saves energy and helps prevent cold spots in the house.
Check Your Unit Before Winter Starts
A lot of people switch their AC to heat mode without checking if it’s working properly. That’s risky.
Before winter fully sets in, schedule an air conditioner servicing appointment. A seasonal check-up ensures:
- The system is clean and efficient
- Thermostat is calibrated
- Coils, filters, and drain lines are in good condition
- Heat mode is operating correctly
Not sure who to call? The REQ Air Conditioning Adelaide team offers expert servicing for split, ducted, and reverse-cycle systems across Adelaide.
Why Smart Temperature Settings Matter
Besides saving money, the right setpoint has other benefits:
- Improved indoor air quality – Helps prevent mould and moisture build-up
- Longer system lifespan – Reduces wear and tear
- Better comfort – No overheating or sudden cold blasts
- Consistent temperature – Keeps the home balanced, even on stormy days
Your unit performs best when it isn’t under pressure. A steady 19°C is better than switching between extremes.
How to Check if Your AC Is Heating Efficiently
Here are a few clues your system may need attention:
- It blows cold air in heat mode
- There’s a burning smell or strange noise
- The system short-cycles or won’t stay on
- Energy bills are rising faster than usual
Any of these signs? Book an air conditioner servicing before the real chill arrives.
Final Thoughts
Now that you know what temperature to set air conditioner in winter, you can stay warm without waste.
Keep it between 18°C and 20°C. Seal off unused rooms. Use natural sunlight. And most importantly – get your unit serviced before winter bites.
Whether you’re using a split system in the bedroom or full Adelaide ducted air conditioning throughout the house, small changes make a big impact.
