How Much to Run a Dehumidifier in Montana? $0.07/Hr, $21/Summer
Running dehumidifier in Montana costs about $0.07 an hour and roughly $21 for the summer — 500 W for 3.1 hours a day at 14.99¢/kWh.
· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23
On this page: CalculatorTableHow we calculatedSources
Jump to calculator ↓Slider nudges the Montana rate; the URL keeps it.
- Per hour
- $0.07 at 14.99¢/kWh
- Per summer
- $21 (92 days)
- Hours per day
- 3.1 (NOAA state cooling degree-days-scaled)
- Degree-days used
- 247 (NOAA CPC state, population-weighted)
- Wattage
- 500 W (typical 300–800)
- Montana rate
- 14.99¢ (July 2026)
- Rank of 20 cold states
- 20 (cheapest)
Why this number
Montana runs dehumidifier less than the national baseline in June–August — 3.1 hours a day on the NOAA state degree-day scaling used here, against 12.0 nationally — and pays 14.99¢/kWh for it. Those two numbers, times 500 W, are the whole $21.
Dehumidifier cost in Montana by hours per day — per day / per summer
| Hours per day | Montana avg 14.99¢ | NorthWestern Energy LL 14.2¢ | Adjustment 2024 12.2¢ | Flathead Electric Coop 9.7¢ |
|---|---|---|---|---|
| 1 h | $0.07 / $7 | $0.07 / $7 | $0.06 / $6 | $0.05 / $4 |
| 2 h | $0.15 / $14 | $0.14 / $13 | $0.12 / $11 | $0.10 / $9 |
| 4 h | $0.30 / $28 | $0.28 / $26 | $0.24 / $22 | $0.19 / $18 |
| 6 h | $0.45 / $41 | $0.43 / $39 | $0.37 / $34 | $0.29 / $27 |
| 8 h | $0.60 / $55 | $0.57 / $52 | $0.49 / $45 | $0.39 / $36 |
| 12 h | $0.90 / $83 | $0.85 / $78 | $0.73 / $67 | $0.58 / $54 |
What Montana’s utilities charge for it
| Utility | Residential customers | ¢/kWh (EIA-861 2024) | Per hour | Per summer at 3.1 h/day |
|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 328,127 | 14.2¢ | $0.07 | $20 |
| Adjustment 2024 | 78,442 | 12.2¢ | $0.06 | $17 |
| Flathead Electric Coop Inc | 63,317 | 9.7¢ | $0.05 | $14 |
What the numbers say about dehumidifier in Montana
Montana logged 247 population-weighted cooling degree-days over June–August (NOAA CPC state series), 26% of the CONUS figure of 958, which is why this page runs dehumidifier 3.1 hours a day against the national 12.0 — 8.9 hours less. At Montana’s July 2026 rate of 14.99¢/kWh that makes it the cheapest of the 20 cold states for dehumidifier: $21 for the 92-day summer, against Montana’s $21 and Alaska’s $103. NorthWestern Energy LLC - (MT), Montana’s largest utility with 328,127 residential customers, averages 14.2¢ — $20 for the same hours — while Flathead Electric Coop Inc at 9.7¢ comes to $14, a $6 spread on identical use. Montana’s July 2026 rate of 14.99¢ sets the $0.07 per hour; its winter average of 13.26¢ is 1.73¢ lower, a difference that matters for heating loads but not for dehumidifier use in June–August.
Frequently asked questions
How much does it cost to run dehumidifier per hour in Montana?
$0.07 an hour for a 500 W unit at Montana’s July 2026 average of 14.99¢/kWh (500 ÷ 1,000 × 0.1499); at NorthWestern Energy LLC - (MT)’s 14.2¢ it is $0.07.
How much does dehumidifier cost for the whole summer in Montana?
About $21: 500 W × 3.1 hours a day × 92 days (June–August) × 14.99¢. The hours are the national 12.0 h/day scaled by NOAA CPC state population-weighted CDD, June–August 2026 (247 against the CONUS 958); enter your own hours above for your own figure.
Is dehumidifier expensive to run in Montana compared with other cold states?
Montana is the cheapest of the 20 cold states on this site at $21 a summer; the range runs from Montana ($21) to Alaska ($103), driven almost entirely by the electricity rate.
How we calculated this
Worked for dehumidifier in Montana: 500 W ÷ 1,000 × 0.1499 $/kWh = $0.07 per hour; hours per day = 12.0 × (247 ÷ 958) = 3.1; 500 ÷ 1,000 × 3.1 × 92 × 0.1499 = $21 for the summer. Rate: EIA Electric Power Monthly 5.6.A (July 2026); degree-days: NOAA CPC state population-weighted CDD, June–August 2026, against the CONUS total; utility prices: EIA-861 2024.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.
Where to go next
- Cost to run dehumidifier (national page) — The 500 W and 12.0 h/day baseline this page scales for Montana, with the sourced benchmark.
- Cost to heat a home in Montana — Gas, propane, oil, heat pump and resistance per MMBtu at Montana’s own prices — the whole-house picture.
- Find your electricity rate by ZIP — Montana averages 14.99¢ but its utilities span the table above — send your own rate into this calculator.
- Solar panel cost in Montana — Montana’s 14.99¢ July rate, utilities and rate history on the solar side.
- Cost to run space heater in Montana — Same Montana rates and degree-days applied to a 1,500 W space heater.
- Cost to run heat pump in Montana — Same Montana rates and degree-days applied to a 3,500 W heat pump.
- Cost to run dehumidifier in Wyoming — $27 for the summer at 14.36¢ and 4.2 h/day — the nearest cold-state comparison.
- Cost to run dehumidifier in North Dakota — $29 for the summer at 13.41¢ and 4.8 h/day — the nearest cold-state comparison.