December in Melbourne means welcoming summer—and the potential for skyrocketing electricity bills. When the heat hits, your air conditioner becomes your best friend, but running it around the clock can quickly drain your wallet.

At Roze Air, your local family-run HVAC experts, we know that staying cool shouldn't have to cost a fortune. That's why we’re sharing three simple, actionable aircon secrets that will keep your home comfortable, energy-efficient, and your budget intact this summer.

You might be tempted to crank your aircon down to a chilly 18° when you first walk in the door, but this is the fastest way to inflate your electricity costs.

The Secret: The optimal setting for comfort and cost saving is between 25° and 27° during the day. Your air conditioner works hard to bridge the gap between the outside temperature and your set temperature. Setting it much lower than 25° makes the unit work excessively hard for minimal gain in perceived comfort, especially since your body adapts quickly.

The Savings: Here is the crucial math: For every single degree lower you set your air conditioner, you can increase your running costs by around 10%. By keeping your aircon a few degrees higher, you save substantial money over a hot Melbourne summer. Try running your system at 26°—you'll likely feel just as comfortable, and your next power bill will thank you.

Think about where you actually spend your time during a hot day. Is it every room in the house, or just the main living area?

The Secret: Focus your cooling efforts only on the rooms you are actively using. This is called  Zone Cooling. If you have a ducted or multi-split system, use the zoning controls to shut off airflow to empty bedrooms, laundry rooms, or storage areas. If you have a single split system, simply close the door to the room being cooled.

The Savings: Your AC system is sized to cool your entire home. By strategically closing doors and turning off zones in unused parts of the house, you drastically reduce the volume of air your system needs to condition, which allows it to cycle off more often, saving energy and money.

While your AC is a lifesaver during the day, Melbourne nights can sometimes cool down significantly, which presents a fantastic opportunity for "free" cooling.

The Secret: If the outdoor temperature is forecast to drop below 22° (often around 10pm in December), try this simple cooling strategy:

1. Switch off your AC before you go to bed.
2. Open windows (and turn on fans if needed) to draw the cool night air into your home.
3. Close all windows and blinds first thing in the morning (around 7am) before the sun rises.

The Savings: By trapping that cool night air inside, you effectively insulate your home and can delay the moment you need to switch the AC back on by several hours, potentially saving you a full night and morning of running costs.

Following the 25° rule and using these simple tips will make a huge difference, but they only work if your air conditioning system is running efficiently.

An older, poorly maintained, or damaged system will struggle to hold a steady temperature, forcing you to set it lower and lower—completely defeating the purpose of these money-saving rules!

If you notice your system:

• Struggling to maintain a comfortable temperature (even at 26°).
• Making strange noises.
• Causing your energy bills to skyrocket despite following these tips.

It’s time to call in the professionals. As a local, family business, Roze Air provides reliable, expert maintenance and repair services across Melbourne. We focus on transparent service and a lower price point, ensuring your system is running at peak efficiency to keep you cool without breaking the bank.

Ready for a stress-free summer? Contact Roze Air today to schedule your system check-up!