Humidifier vs. whole-house humidifier: running cost
A whole-house humidifier is cheaper to run: about $3 a year versus $9 for a humidifier at typical use and 17.99¢/kWh, a $5 difference.
| Humidifier | Whole-house humidifier | |
|---|---|---|
| Typical watts | 30 W | 20 W |
| Watt range | 10–400 W | 10–2,500 W |
| Typical use | 10 hours a day for 5 months a year | 12 hours a day for 5 months a year |
| Energy per year | 48 kWh | 18 kWh |
| Cost per hour | 0.5¢ | 0.2¢ |
| Cost per day | 5.6¢ | 2.2¢ |
| Cost per month | $1.72 | $0.66 |
| Cost per year | $9 | $3 |
| Per year in Hawaii (43.51¢) | $21 | $8 |
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What drives the difference
- Humidifier: Ultrasonic humidifiers use 20-40 W and evaporative wick models 30-70 W. Warm mist and steam models boil water and use 200-400 W.
- Whole-house humidifier: Bypass and fan-powered furnace humidifiers draw only a solenoid and small fan (10-100 W). Electric steam models use 1,500-2,500 W while making steam.
Ways to cut either cost
Adjusts humidity to outdoor temperature so it runs only as needed.
See options on AmazonUses about 30 W versus 300 W for warm mist models.
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Frequently asked questions
Which costs more to run, a humidifier or a whole-house humidifier?
At typical use and the U.S. average rate (17.99¢/kWh), a humidifier costs about $9 a year versus $3 for a whole-house humidifier. That's $5 more, or 2.6× as much.
How many watts do humidifier and whole-house humidifier use?
A humidifier typically draws 30 W (range 10–400 W). A whole-house humidifier draws 20 W (range 10–2,500 W). Watts alone don't decide cost. Hours of use, cycling and standby matter just as much.
Rates: EIA, 12 months ending 2026-07. Methodology.