Dehumidifiers improve comfort and prevent mold.
But since they can run for hours at a time, how much do they actually cost to operate?
Let’s break down the real electricity usage and monthly cost.
Quick Answer
Most dehumidifiers use:
• 300–700 watts
At $0.16 per kWh:
500W model = 0.5 kWh
👉 $0.08 per hour
That’s:
• $0.64 for 8 hours
• $2.40 per day (24h use)
• $20–$50 per month depending on runtime
Average Electricity Cost per kWh by State (2026 U.S. Data)
Dehumidifier Electricity Cost Table
| Wattage | Cost Per Hour | 8 Hours | 30 Days (8h/day) |
|---|---|---|---|
| 300W | $0.05 | $0.40 | $12 |
| 500W | $0.08 | $0.64 | $19 |
| 700W | $0.11 | $0.88 | $26 |
Most homes run them 6–12 hours daily, not 24/7.
Monthly Cost Example
If running 10 hours per day:
500W × 10h = 5 kWh
5 × $0.16 = $0.80 per day
$0.80 × 30 = $24 per month
Does Size Matter?
Yes.
Dehumidifiers are rated in pints per day (20, 35, 50, 70 pints).
Larger capacity units:
• Use more watts
• Remove more moisture faster
• May run fewer hours
Bigger isn’t always more expensive overall.
Energy Star Models
Energy Star dehumidifiers use:
• 10–15% less electricity
• Improved compressor efficiency
Replacing an old unit can reduce annual cost by $20–$40.
Dehumidifier vs Air Conditioner
Air conditioners also remove humidity.
But they use:
1,000–3,500 watts
How Much Does It Cost to Run a Portable Air Conditioner?
AC is much more expensive for humidity control alone.
Is Running It All Day Expensive?
If running 24 hours:
500W × 24h = 12 kWh
12 × $0.16 = $1.92 per day
≈ $58 per month
Continuous operation adds up.
FAQ
Do dehumidifiers use a lot of electricity?
Moderate use. More than a TV, less than a space heater.
Is it expensive to run one overnight?
No. 8 hours usually costs under $1.
Should I leave it on all the time?
Better to use humidity sensors or timers.
Are Energy Star dehumidifiers worth it?
Yes, especially in humid climates.
Final Thoughts
Dehumidifiers are mid-range electricity users.
Used strategically, they improve air quality and prevent mold without dramatically increasing your bill.
Understanding wattage and runtime is key to controlling cost.
