Is the GWC-18Charmo/O expensive to run?
Not really — it's on the better side of average. Of the 16 systems on Singapore's register around this size, 6 cost less to run.
Runs at
$48/month
About $580 a year
Cheapest its size
$42/month
Daikin RZF50DVMG
Size group
5.0–5.9 kW
16 systems, all brands
That is about $7 a month more than the cheapest system its size, or roughly $820 over ten years — before you weigh purchase price, which often runs the other way.
Registered with the same figures as GREE GWC18ATEXF-K6DNA3B/O. On paper they are the same machine.
Cheaper systems the same size
Closest in size first. Cheaper to run is not the same as the better buy — purchase price, indoor units, and how well it is installed all sit outside these figures.
| Model | Capacity | Green ticks | Runs at | You would save |
|---|---|---|---|---|
| Mitsubishi Electric SUY-ZM50VA-SG | 5.11 kW | 5 ticks | $43/month | $5/month |
| Hitachi PAS-2.0UFASNQ1 | 5.04 kW | 4 ticks | $43/month | $5/month |
| Daikin RZF50DVMG | 5.02 kW | 4 ticks | $42/month | $7/month |
- Capacity
- 5.11 kW
- Green ticks
- 5 ticks
- Runs at
- $43/month
- You would save
- $5/month
- Capacity
- 5.04 kW
- Green ticks
- 4 ticks
- Runs at
- $43/month
- You would save
- $5/month
- Model
- Daikin RZF50DVMG
- Capacity
- 5.02 kW
- Green ticks
- 4 ticks
- Runs at
- $42/month
- You would save
- $7/month
Looking at the GWC-18Charmo/O for your home?
This is the outdoor half of a pair. The indoor unit is the half you live with, and it should be named before anything is agreed.
What to pin down before you commit
- The paired indoor model number — the unit that mounts in the room
- Whether the capacity suits that room, and how that was decided
- What happens to the existing piping, drainage and bracket
- Whether the old unit is being removed and disposed of
Figures are NEA energy-label records checked 17 Sept 2026, priced at the label's 27¢/kWh assumption. Your own bill depends on how you actually use it. Look up a fault code if one is already installed. Compare every registered model, or read more on Gree systems. Common aircon problems have their own pages.