Cutting Your Power Bill — Starting with the Aircon
In a Malaysian home, cooling is almost always the biggest line on the TNB bill. The good news: the changes that save the most are habits, not expensive gadgets.
Everyone wants a lower electric bill, and most of the advice online is fiddly stuff that barely moves the needle. Let me focus you on where the real money is — the aircon — then the handful of other things worth doing.
Why cooling dominates the bill
In our climate, air-conditioning is typically the single largest electricity load in a home, well ahead of lights and most appliances. That is exactly why it is where your attention pays off most — a small change in how you run the aircon beats switching off a dozen standby lights.
Aircon habits that actually save
- Set 24–26°C, not 18°C. Every degree lower makes the compressor work harder. A higher setpoint is the single easiest saving.
- Run a fan with it. Moving air makes you feel cooler, so you stay comfortable at a higher temperature.
- Use sleep / timer mode. Sleep mode lets the temperature drift up gently overnight, balancing comfort and energy; a timer avoids cooling an empty room till morning.
- Clean the filters. A clogged filter forces the unit to work harder for less cooling — a 10-minute job that pays back monthly.
- Service regularly and right-size the unit. An undersized or poorly serviced unit runs constantly and still struggles.
- Shade the windows. Curtains or tinted glass cut the heat the aircon has to fight.
Beyond the aircon
💡 Easy wins
- Switch to LED lighting
- Turn off true standby loads at the plug
- Use the water heater on demand, not all day
🧊 Appliances
- Keep the fridge full-ish and sealed well
- Full loads for washing
- Choose higher energy-rating units when replacing
The 60-second checklist
- Aircon at 24–26°C with a fan running.
- Filters cleaned this month.
- Standby devices off at the plug overnight.
- Lights are LED; water heater not left on all day.
House-hunting? Energy efficiency is worth checking too
Orientation, ventilation and window shading quietly shape your future bills. I factor that in when I help clients choose — happy to do the same for you. I am Louis Koh, over a decade in Johor Bahru property.
Frequently asked questions
What aircon temperature saves electricity?
Around 24–26°C. Every degree lower makes the unit work harder, so a higher setpoint with a fan is the easiest saving.
Does a fan with the aircon help?
Yes — moving air makes you feel cooler, so you can set a degree or two higher for the same comfort.
Is an inverter aircon worth it?
Generally yes for rooms used for longer periods — it adjusts output instead of cycling fully on and off, so it runs more efficiently over time.
What uses the most electricity at home?
Usually air-conditioning, then water heating. Clean filters, the right temperature and regular servicing matter most.
Want to see actual projects?
From Johor Bahru to Kuala Lumpur, I keep a documented list of what is selling now — take a look and see what fits.