Calculate your cost
Start with the example below, then replace the wattage, daily runtime, and rate with the numbers for your portable air conditioner.
This setup uses about 288 kWh in a 30-day month.
Please enter valid values within the ranges shown.
| Schedule | Hours/day | Cost/month |
|---|---|---|
| Half runtime | 4 | $27.12 |
| Page example | 8 | $54.23 |
| Longer runtime | 12 | $81.35 |
Same 1,200-watt input and 18.83¢/kWh rate; only runtime changes.
Formula for the page example
1.2 kW × 8 hr × $0.1883 = $1.81 per day
Convert watts to kilowatts, multiply by the active hours used each day, then multiply by the electricity price in dollars per kWh. Multiply the daily result by 30 for the monthly estimate shown above.
How to read this estimate
Portable units typically cool less efficiently than window models and draw more power to move the same amount of heat.
Use this as a baseline until you can check the label or measure the portable air conditioner directly. Model, settings, condition, climate, and household routine can all change the result.
What changes the cost?
- 01
BTU rating
- 02
Room size and insulation
- 03
Outdoor temperature
Ways to spend less
- Vent the exhaust hose straight out without sharp bends.
- Keep doors to the cooled room closed.
- Clean the intake filter frequently.