6 min read · 24 November 2025
How to Lower Your AC Electricity Bill in Bali
Air conditioning is the single biggest line item on most Bali PLN bills. Here are twelve practical ways to cut it without sweating through the night.
By I Made Suarjana, Lead Technician
TL;DR
Setting the AC to 25°C instead of 22°C, running fan-only mode in the evening, and upgrading to inverter can each cut your AC bill by 15–25%. Combined, most Bali villas can roughly halve their cooling power consumption.
1. Set to 25°C, not 22°C
Every degree below 25°C adds roughly 6–8% to your power consumption. Setting the AC to 22°C in a Bali bedroom doesn't make you sleep better — it just makes you cold and runs the compressor flat-out. 25°C with the ceiling fan on low is the comfort sweet spot in Bali.
2. Use the ceiling fan with the AC
A ceiling fan on speed 1 lets you raise the AC setpoint by 3°C without losing comfort. Saving: ~20% on AC power.
3. Run fan-only for 10 minutes at the end of each session
This dries the evaporator coil and prevents mould — which improves cooling efficiency on the next session by keeping the coil clean.
4. Close doors and windows
Sounds obvious — and yet half the villas we visit have an exterior louvre window cracked open or a guest bedroom door propped open. Cool air leaks out, the AC runs harder.
5. Block direct sun on west-facing glass
A blackout curtain or external sunscreen on west-facing glass cuts late-afternoon solar gain by 40–60%. The AC works less hard from 4pm to 7pm.
6. Service the unit quarterly
A clean evaporator coil and outdoor condenser run 15–25% more efficient than a neglected unit. The cost of a quarterly service is typically recovered through reduced PLN bills.
7. Replace 1.5mm² cabling with 2.5mm² (older villas)
Undersized cable to the outdoor unit causes voltage drop, which makes the compressor draw more current to do the same work. We see this on older Canggu and Sanur villas — fixing it cuts power by 5–8% per unit.
8. Upgrade to inverter
Non-inverter to inverter upgrade saves 30–40% on running cost. A 1 PK inverter pays back the price premium well within service life.
9. Right-size the unit
An undersized AC runs flat-out 24/7 and never reaches setpoint — burning power and wearing the compressor. An oversized unit short-cycles and doesn't dehumidify. Right-sizing alone (replacing a struggling 0.5 PK with a properly sized 1 PK) can cut power use by 20%.
10. Use a programmable timer
Most modern ACs have a 24-hour timer. Set it to off 30 minutes before you usually leave the bedroom in the morning, and on 30 minutes before you return in the evening. Saves 1–2 hours of unnecessary runtime per day.
11. Add a surge protector
Power surges damage capacitors and PCBs, which then run inefficiently for weeks before they finally fail. A surge protector at the outdoor isolator prevents this and protects 5–8% of efficiency over the life of the unit.
12. Switch to a higher PLN tariff if needed (counter-intuitive)
If you're on the low residential tariff (R-1/450 VA) and your villa keeps tripping the meter, you're forcing the AC to short-cycle. Upgrading to R-1/2200 VA or R-1/3500 VA actually lowers your overall bill by allowing the AC to run smoothly.
Real example
A 4-bedroom Canggu villa we serviced was running well above the local average on PLN. We:
- Replaced two undersized 0.5 PK units with 1 PK inverters
- Added surge protectors on all 6 outdoor units
- Set up a quarterly service schedule
- Trained the housekeeper to set 25°C standard
Six months later, the same villa was paying significantly less on PLN — the unit upgrades and surge protectors paid back well inside a year.