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How Much Does It Cost to Run a Humidifier? $0.03/Hr, $10.20/Mo

Running a humidifier at 200 watts for 10 hours a day costs about $0.34 a day and $10.20 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $51 a year.

200 W (30–400 W)Typical power draw
10 h/day, 30 days/monthAssumed use
2.00 kWhEnergy per day

· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

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a humidifier: energy cost only (200 W ÷ 1,000 × hours × rate); fixed fees and taxes extra.
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Slider nudges the rate for a humidifier; the URL keeps it.

## How much does it cost to run a humidifier?

The same a humidifier at 10 hours a day costs $7.20 a month at 12¢ and $27.00 at 45¢ — usage held constant, only the rate moving:

Table 1: How Much Does It Cost to Run a Humidifier? $0.03/Hr, $10.20/Mo
Electricity rate Per hour Per day Per month in season Per year
12¢/kWh $0.024 $0.24 $7.20 $36
15¢/kWh $0.030 $0.30 $9.00 $45
17¢/kWh (US avg) $0.034 $0.34 $10.20 $51
20¢/kWh $0.040 $0.40 $12.00 $60
25¢/kWh $0.050 $0.50 $15.00 $75
30¢/kWh $0.060 $0.60 $18.00 $90
35¢/kWh $0.070 $0.70 $21.00 $105
45¢/kWh $0.090 $0.90 $27.00 $135
Typical power draw
200 W (30–400 W)
Assumed use
10 h/day, 30 days/month
Energy per day
2.00 kWh
Cost per day
$0.34
Cost per month
$10.20
Cost per year
$51

Why this number

Running a humidifier at 200 watts for 10 hours a day costs about $0.34 a day and $10.20 a month at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢) — roughly $51 a year. The formula for a humidifier: 200 W ÷ 1,000 × hours × your rate per kWh. For a humidifier your own rate changes the answer: at 12¢/kWh that month costs $7.20, at 45¢/kWh it costs $27.00.

A humidifier rated at 200 watts, run 10 hours a day, costs about $0.34 a day — about $10.20 a month, or $51 a year — at the US average electricity rate of 17¢/kWh. That places it 25th of the 40 appliances tracked here, near the bottom. It is not where a high bill comes from, and switching it off will not rescue one.

What actually drives this number

Evaporative and ultrasonic models draw very little; warm-mist models boil water and draw far more. Check which type you own before assuming the cost is negligible. Costed over a five-month heating season, when indoor air is dry.

For a humidifier the unit that matters is the kilowatt-hour, not the kilowatt : 200 W is only the rate of use, and 10 hours a day is what turns it into the 300 kWh a year you are actually billed for. On that yearly measure its nearest always-on neighbor is the chest freezer at about 298 kWh.

Where this number comes from

Putting Humidifier in proportion

At 17¢/kWh, a humidifier next to the rest of the bill:

For a humidifier: this is an always-on load, and that is the whole story. Humidifier’s wattage is unremarkable; the 24-hour duty cycle is what puts a humidifier where it is. Reducing run-hours is usually impossible for a humidifier, which makes efficiency at purchase time the only real decision. On this site’s own numbers, a humidifier lands at #25 of 40 on the monthly-cost ranking, at about $10.20 for a typical month.

The formula, in full

The 200 W arithmetic for a humidifier, step by step:

  1. Watts to kilowatts. 200 W ÷ 1,000 = 0.20 kW.
  2. Energy per day. 0.20 kW × 10 hours = 2.00 kWh.
  3. Cost per day. 2.00 kWh × $0.17 = $0.34.
  4. Cost per month. $0.34 × 30 days = $10.20.

For a humidifier the two levers are run-hours (10 h/day here) and your rate; at 10 hours a day, 200 W adds up — which is why always-on loads dominate the rankings.

Other always-on loads: Chest freezer ($51/yr), Well pump ($62/yr), Refrigerator ($67/yr). Closest on annual cost: NAS (home server) ($53/yr), Dishwasher ($41/yr). Across all other always-on loads here, the cheapest is Water softener at $0.37/mo and the priciest is Pool pump at $40.80/mo.

The a humidifier table above runs a fixed rate ladder (12–45¢); the state quick-fill uses July 2026 averages from EIA Electric Power Monthly, Table 5.6.A .

Put a humidifier ($10.20 a month) against everything else in the electricity cost calculator , check your state’s rate , or browse all 40 appliances ; year-round high bills: solar savings calculator .

Frequently asked questions

How much does it cost to run a humidifier per hour?

About $0.034 an hour for a humidifier at 17¢/kWh, the EIA 2025 annual US average (July 2026 monthly: 18.31¢), for a 200 W unit. The calculation is 200 ÷ 1,000 × 1 hour × $0.17 per kWh. At 30¢/kWh the same hour costs $0.060.

How much does a humidifier add to my monthly bill?

Roughly $10.20 a month for a humidifier at 10 hours a day, 30 days a month, 17¢/kWh. That is about $51 a year across a 5-month season. For a humidifier, change the 10-hour default to your own use — run-time moves the total as much as the 200 W does.

How many watts does a humidifier use?

Typically around 200 W, with real units ranging from about 30 to 400 W depending on size, model and setting. The nameplate on your own unit is the figure to trust — these are typical values for planning, not a measurement of your appliance.

Why is my actual bill higher than the a humidifier figure?

$10.20 a month is the energy cost of a humidifier alone; your bill adds fixed connection charges, delivery fees, taxes and every other load. Add the other appliances in the index to a humidifier for the controllable part of the bill.

How we calculated this

Worked for a humidifier: 200 W ÷ 1,000 × 10 h × $0.17 = $0.34 a day; × 30 days = $10.20 a month; × 5 months in use = $51 a year. 200 W and 10 h are the typical figures cited for a humidifier; 17¢ is EIA’s 2025 annual US average.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

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