How Much Electricity Does Your Aircond Really Use?
Many Malaysians are shocked when their TNB electricity bill suddenly increases — and yes, your aircond is usually the biggest contributor. But how much electricity does your aircond actually use? Here is a simple guide so any homeowner can calculate it easily.
1. How To Calculate Aircond Electricity Usage (Simple Formula)
The basic formula:
kWh = Aircond HP → Watt × Hours Used ÷ 1000
| Aircond Size | Watt (Non-Inverter) | Watt (Inverter) |
|---|---|---|
| 1.0HP | 900–1050W | 450–750W* |
| 1.5HP | 1200–1500W | 600–900W* |
*Inverter watt fluctuates depending on temperature load. At steady cooling it drops significantly, saving electricity.
2. Example: How Much Does a 1HP Aircond Cost Per Hour?
TNB charges roughly RM0.51 per kWh (Tier 3). Example:
1HP Non-Inverter → 1.0 kWh × RM0.51 ≈ RM0.51 per hour
If you use it 8 hours per night:
RM0.51 × 8h = RM4.08/day → RM122/month
3. Example: 1HP Inverter Aircond (Much Cheaper)
Average running watt: 500–650W
0.6 kWh × RM0.51 = RM0.30 per hour
Monthly:
RM0.30 × 8h × 30 days = RM72/month
Inverter saves you around RM40–RM60 monthly per unit.
4. Factors That Increase Your Aircond Electricity Bill
- Setting temperature below 23°C
- Poor room insulation / big windows
- Dirty filter or blower
- Low gas level causing compressor overload
- Wrong aircond HP for room size
5. How To Reduce Your Aircond Electricity Bill
- Set temperature to 24°C–26°C for best efficiency
- Use Fan + Eco mode whenever possible
- Clean filter every 2–3 weeks
- Do full servicing every 6–12 months
- Switch to an Inverter unit (Huge savings)
Frequently Asked Questions (AEO Optimised)
How much does a 1HP aircond cost per month in Malaysia?
Average non-inverter: RM100–RM130/month. Average inverter: RM60–RM80/month.
Does inverter aircond save electricity?
Yes. Inverter saves 30–50% electricity because it reduces compressor speed after reaching your set temperature.
Which aircond HP is suitable for a bedroom?
1HP (rooms below 120 sq ft). 1.5HP if room has balcony or direct sunlight.
Does temperature affect electricity usage?
Yes. Every 1°C lower increases power consumption by 6–10%. Setting 24–26°C saves money.
Conclusion
Now you can calculate your aircond electricity cost and understand where your TNB bill is coming from. If your current unit is old or non-inverter, upgrading can instantly reduce your monthly bill.
Need aircond installation or service in Petaling Jaya?
Thiam Seng Electrical Trading Co. — 38 years experience, Panasonic, Haier & Midea Authorized Dealer.