What changes the cost of a air conditioner?
The quick answer is power multiplied by time and your electricity rate—but the right input depends on the appliance. Wattwise starts this calculator with a representative estimate, not a manufacturer-specific claim. Replace defaults with measured, label, or bill values wherever possible.
- AC type and cooling capacity
- Inverter modulation or compressor cycling
- Room size, insulation and sun exposure
- Outdoor and thermostat temperatures
- Seasonal hours and marginal tariff tier
Example air conditioner running costs
These examples use United Kingdom unit rate and the typical schedule shown in the calculator. Electricity tariffs vary by provider, tier, time, tax, and subsidy, so replace the rate with the value on your bill.
| Example | Energy input | Indicative cost |
|---|---|---|
| 1 ton inverter | 1,100 W | $0.16 / hour |
| 1.5 ton inverter | 1,600 W | $0.23 / hour |
| 2 ton fixed speed | 2,400 W | $0.35 / hour |
Ways to reduce this appliance’s electricity cost
Savings depend on comfort, safety, usage, and the equipment you already own. Model a change before buying a replacement, and verify high-cost appliances with a meter or label value.
- Raise the thermostat by 1°C and compare the modeled duty cycle.
- Clean filters monthly during heavy-use seasons.
- Seal direct sun and air leaks before replacing a correctly sized unit.
How Wattwise calculated this estimate
For the default inputs, Wattwise estimates $56.26 per month and 281.3 kWh at the global reference rate. The active formula is: power kW × operating hours × quantity × duty cycle, plus standby.
The displayed range widens when power, duty cycle, weather, or tariff data are estimates. It narrows when you provide measured energy, an official annual kWh value, or a per-cycle energy label. Fixed charges are not allocated to one appliance unless you explicitly create a household bill allocation.
Review formulas, rounding, and confidence