Swamp cooler (evaporative) Electricity Cost in Washington — $13.26/month (2026)
Washington monthly
$13.26
U.S. average monthly
$17.26
Difference
-$4.00
← Swamp cooler (evaporative) (all states) · Washington electricity rate
Quick rate
Daily cost
$0.44
Monthly cost
$13.26
+$0.00 vs typical
Yearly cost
$161.30
kWh / month
96.0 kWh
Local monthly estimate: $13.26 · U.S. average equivalent: $17.26
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ad-after-calculator Quick answer
Running a typical swamp cooler (evaporative) in Washington costs about $0.44/day or $13.26/month at roughly $0.138/kWh, assuming 8 hours of use per day at 400 W. The U.S. average rate is about $0.180/kWh, so Washington is roughly 23% lower than average for this estimate.
vs U.S. average
Local rate (Washington)
$0.138/kWh
Monthly estimate: $13.26
U.S. average rate
$0.180/kWh
Monthly estimate: $17.26
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ad-after-state-table FAQ
- Most swamp cooler (evaporative) units fall between 200 W and 800 W, with 400 W as a typical value for estimates.
- Our calculator uses 400 W as the typical wattage, within a reported range of 200–800 W.
- At 8 hours/day and 400 W, the estimate is about 3.20 kWh per day.
- Using 8 hours/day, the estimate is about 96.0 kWh per month.
- Per hour, swamp cooler (evaporative) uses about 0.400 kWh (at 400 W).
- At typical use (400 W and 8 hours/day), the estimate is about $0.44/day at roughly $0.138/kWh.
- At typical use (400 W and 8 hours/day), the estimate is about $13.26/month at roughly $0.138/kWh.
- Running for one hour at 400 W costs about $0.055 per hour (using the Washington rate of about $0.138/kWh).
- For typical use, the calculator estimates about $13.26/month for swamp cooler (evaporative) in Washington.
- At the typical Washington residential rate, the estimate is about 96.0 kWh per month, which corresponds to roughly $13.26/month for swamp cooler (evaporative).
- Compared to the U.S. average, Washington is about 23% lower for this estimate. Monthly cost is about $13.26 in Washington vs $17.26 at the national average.
- Start with practical steps from our tips list (e.g., Seal air leaks and improve insulation to reduce run-time.). Smaller changes reduce kWh usage, which reduces the bill at your local rate.
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Est. monthly at Washington rate ($0.138/kWh)