How much does it cost to run a portable evaporative cooler?
A typical portable evaporative cooler draws about 400 watts. Used 6 hours a day, that works out to roughly $0.41 per day, $5.10 per month, and $61.20 per year on an average electricity rate of 17¢ per kWh. Evaporative coolers consume less power than air conditioners but are only effective in dry climates.
Portable Evaporative Cooler running cost calculator
- Per day
- $0.41
- Per month
- $5.10
- Per year
- $61.20
- CO₂ / year
- 144 kg
Based on 360 kWh per year. Adjust the price per kWh to match your latest electricity bill for an exact figure.
The number that matters most is your own electricity rate. Rates range from under 11¢ per kWh in some regions to over 30¢ in others, so the same portable evaporative cooler can cost two or three times as much depending on where you live. Enter your exact rate in the calculator above to get a figure tailored to your bill.
Cooling appliances such as the portable evaporative cooler tend to spike your bill in summer and sit idle the rest of the year. Because they cycle on and off rather than drawing full power continuously, the watts shown are the running draw — the longer and hotter the season, the closer your real cost gets to the annual figure above.
At 400 watts, the portable evaporative cooler is a low-power device, so its cost per hour is small. The annual total only becomes meaningful if it runs for many hours a day — which is exactly why long-running low-wattage devices are easy to overlook on a bill.
Over a full year this portable evaporative cooler uses about 360 kWh of electricity and is responsible for roughly 144 kg of CO₂ emissions on an average grid. Since it is used only part of the year, your real footprint scales with the season — the annual figure assumes a typical usage pattern.
To put the draw in everyday terms, one hour of running this portable evaporative cooler uses about as much electricity as charging a smartphone 33 times. It is a rough comparison, but it makes an abstract wattage figure easier to picture.
If this portable evaporative cooler is one you use daily, even small efficiency gains compound. Cutting its usage or wattage by 20% would save around $12.24 every year — money that an efficient replacement can recover over its lifetime.
Frequently asked questions
- How much does it cost to run a portable evaporative cooler per hour?
- At 400 watts and a 17¢/kWh rate, a portable evaporative cooler costs about $0.07 per hour to run.
- How much electricity does a portable evaporative cooler use per month?
- Running 6 hours a day, a portable evaporative cooler uses roughly 30.0 kWh per month, costing about $5.10.
- How many kWh does a portable evaporative cooler use per year?
- Used 6 hours a day for 150 days a year, a portable evaporative cooler consumes about 360 kWh annually — that is the figure your electricity rate is multiplied by to get the $61.20 yearly cost.
- Is a portable evaporative cooler expensive to run?
- Not particularly — at around $61.20 per year, a portable evaporative cooler is a relatively minor part of most electricity bills.
- How much CO₂ does a portable evaporative cooler produce?
- On an average grid, a portable evaporative cooler used this much is responsible for roughly 144 kg of CO₂ per year. The exact figure depends on how clean your local electricity supply is.
- How can I reduce my portable evaporative cooler running costs?
- Use it during off-peak hours if your utility offers time-of-use pricing, reduce daily run time, and consider an ENERGY STAR rated portable evaporative cooler, which uses less power for the same job.