Quick Answer: Most dehumidifiers draw between 150 and 1,400 watts depending on size — a compact 20-pint unit sits near the low end, a standard 50-pint compressor unit runs roughly 300–700 watts, and a whole-house ducted unit can pull over 1,000 watts. At the EIA’s national average residential electricity rate of 18.44 cents per kWh (August 2026), a typical 500-watt unit running 8 hours a day costs about $0.74 a day, or roughly $22 a month — but an efficient 280-watt unit doing the same job costs closer to $0.41 a day. Wattage, not pint rating, is what actually predicts the power bill.
A dehumidifier’s box advertises pints-per-day, but that number tells you almost nothing about what it costs to run. Two units rated at the same 50 pints a day can draw wildly different wattage, and the gap compounds fast once a unit is running most hours of a humid season. Here’s what the real numbers look like.
Electricity use by the numbers
- 150–1,400 watts: the full range across dehumidifier categories, from a compact 20-pint closet unit up to a ducted whole-house model, based on current manufacturer spec sheets.
- 18.44¢ per kWh: the U.S. average residential electricity rate as of August 2026, per the U.S. Energy Information Administration — up from roughly 16.5¢ earlier this year.
- 512W vs. 978W: the measured draw of two 50-pint units with the same capacity rating — the Midea Cube 50 (per Dehumidifier Buyer’s Guide testing) versus Frigidaire’s FHDD5034W1 (per Frigidaire’s own 8.5-amp spec) — nearly a 2x gap for identical water removal.
- 2.01 L/kWh: the minimum Integrated Energy Factor a 25–50 pint portable unit needs to carry the ENERGY STAR label under the current Version 6.0 specification — the standardized way to compare real efficiency instead of guessing from wattage alone.
What different sizes actually draw
| Capacity | Typical wattage | kWh at 8 hrs/day | Cost per day* | Cost per month* |
|---|---|---|---|---|
| 20–30 pint (compact) | 150–350W | 1.2–2.8 kWh | $0.22–$0.52 | ~$7–$16 |
| 50 pint (standard, efficient) | ~280–512W | 2.2–4.1 kWh | $0.41–$0.76 | ~$12–$23 |
| 50 pint (standard, less efficient) | ~700–978W | 5.6–7.8 kWh | $1.03–$1.44 | ~$31–$43 |
| Whole-house / ducted | 800–1,400W | 6.4–11.2 kWh | $1.18–$2.07 | ~$35–$62 |
*At the EIA's August 2026 national average rate of 18.44¢/kWh, assuming 8 hours of actual compressor run time a day. Local rates range from about 12¢/kWh in Idaho to over 50¢/kWh in Hawaii.
AEOCKY 4500 Sq. Ft (80 Pint)
- Removes up to 80 pints a day on roughly 280 watts — less power than many 50-pint units use for nearly half the water removal.
- Carries ENERGY STAR's Most Efficient 2025 designation, the tier above the base certification.
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Why your real bill is usually lower than the math suggests
The wattage-times-hours math above assumes the compressor runs continuously, but almost no dehumidifier actually does that. A humidistat shuts the compressor off once the room hits its target humidity, then cycles it back on as moisture creeps back up — so a “500-watt” unit typically draws that much only while it’s actively pulling water, not for every hour it’s plugged in. That’s also why the first few days in a genuinely damp basement or crawl space cost more than the weeks after: once the space reaches its set point, the unit is only topping off rather than fighting a full moisture load. Two things move the real number more than anything on the spec sheet: how leaky or humid the space is to begin with, and whether the humidistat is actually cycling the unit off — a broken or miscalibrated one that never shuts off turns an efficient unit into an expensive one. See our dehumidifier maintenance guide if a unit seems to be running nonstop.
The bottom line
Pint rating tells you how much water a dehumidifier can remove; wattage and its ENERGY STAR Integrated Energy Factor tell you what that costs. A 280-watt unit and a 978-watt unit can carry the identical 50-pint rating and still differ by roughly $30 a month at typical runtime — a gap that adds up fast over a full humid season. If running cost matters more than sticker price, start with our energy efficient dehumidifier guide for current watt-per-pint leaders, use our dehumidifier size guide to avoid buying more capacity (and wattage) than the room needs, and check whether Amazon Prime is worth it for dehumidifier shoppers before you check out.