utility · 600W typical
Running a crawlspace dehumidifier costs about $37.42/month.
That's the typical crawlspace dehumidifier at 600W, run 18 hours a day at the US-average rate of 16.5¢/kWh. Change any of those and the number moves — use the calculator below to see yours.
Estimated cost
A crawlspace dehumidifier draws full power only while the thermostat/compressor is running — about 12.6 effective hours at 600W across your 18-hour window.
How you use it
Cost shifts with how long it's on.
The same crawlspace dehumidifier can cost very different amounts depending on usage patterns. Three common scenarios, at the US-average rate.
humid season
$37.42
per month
runs most of the day May-Sept
off-season
$12.47
per month
intermittent cycles
Where you live
$67.81 spread between the cheapest and priciest states.
Same appliance, same hours of use, different zip code — the monthly cost varies this much.
| State | Rate | Monthly | Yearly |
|---|---|---|---|
| Hawaii | 41.2¢ | $93.44 | $1,136.87 |
| California | 31.4¢ | $71.22 | $866.45 |
| Massachusetts | 30.8¢ | $69.85 | $849.90 |
| Connecticut | 28.7¢ | $65.09 | $791.95 |
| Rhode Island | 27.9¢ | $63.28 | $769.87 |
| New Hampshire | 24.6¢ | $55.79 | $678.81 |
| Alaska | 24.3¢ | $55.11 | $670.53 |
| New York | 22.3¢ | $50.58 | $615.35 |
| Maine | 22.1¢ | $50.12 | $609.83 |
| Vermont | 21.5¢ | $48.76 | $593.27 |
| Michigan | 19.3¢ | $43.77 | $532.56 |
| New Jersey | 19.1¢ | $43.32 | $527.05 |
| Maryland | 18.4¢ | $41.73 | $507.73 |
| Pennsylvania | 18.1¢ | $41.05 | $499.45 |
| District of Columbia | 17.8¢ | $40.37 | $491.17 |
| Wisconsin | 17.4¢ | $39.46 | $480.14 |
| Delaware | 17.2¢ | $39.01 | $474.62 |
| Illinois | 16.9¢ | $38.33 | $466.34 |
| Ohio | 16.6¢ | $37.65 | $458.06 |
| Nevada | 16.3¢ | $36.97 | $449.78 |
| Indiana | 15.8¢ | $35.83 | $435.99 |
| Virginia | 15.7¢ | $35.61 | $433.23 |
| Minnesota | 15.6¢ | $35.38 | $430.47 |
| Colorado | 15.4¢ | $34.93 | $424.95 |
| Alabama | 15.2¢ | $34.47 | $419.43 |
| West Virginia | 15.2¢ | $34.47 | $419.43 |
| Florida | 15.1¢ | $34.25 | $416.67 |
| New Mexico | 14.8¢ | $33.57 | $408.39 |
| Texas | 14.8¢ | $33.57 | $408.39 |
| Arizona | 14.7¢ | $33.34 | $405.63 |
| South Carolina | 14.7¢ | $33.34 | $405.63 |
| Kansas | 14.6¢ | $33.11 | $402.87 |
| Georgia | 14.2¢ | $32.21 | $391.83 |
| Iowa | 14.1¢ | $31.98 | $389.08 |
| North Carolina | 13.9¢ | $31.53 | $383.56 |
| Missouri | 13.6¢ | $30.84 | $375.28 |
| Oregon | 13.4¢ | $30.39 | $369.76 |
| Tennessee | 13.3¢ | $30.16 | $367.00 |
| Kentucky | 13.2¢ | $29.94 | $364.24 |
| Mississippi | 13.1¢ | $29.71 | $361.48 |
| Oklahoma | 13.1¢ | $29.71 | $361.48 |
| South Dakota | 12.7¢ | $28.80 | $350.44 |
| Montana | 12.4¢ | $28.12 | $342.17 |
| Nebraska | 12.2¢ | $27.67 | $336.65 |
| Arkansas | 12.1¢ | $27.44 | $333.89 |
| Washington | 12.1¢ | $27.44 | $333.89 |
| Louisiana | 11.9¢ | $26.99 | $328.37 |
| Wyoming | 11.6¢ | $26.31 | $320.09 |
| North Dakota | 11.5¢ | $26.08 | $317.33 |
| Utah | 11.4¢ | $25.86 | $314.57 |
| Idaho | 11.3¢ | $25.63 | $311.81 |
Efficient vs. inefficient
A $303.53/year difference across the wattage range.
Swapping a high-draw model for an efficient one pays for itself. Here's what that looks like annually at typical usage.
Most efficient
500W
$31.19 per month
$379.42 per year
Typical
600W
$37.42 per month
$455.30 per year
High draw
900W
$56.13 per month
$682.95 per year
When it hits hardest
summer peak
Heaviest use May-Sept.
Ways to cut the cost
- 1
Install vapor barrier first — dehumidifier runs 50-70% less with one
Cuts kWh 1,000-2,000 annually
- 2
Set humidistat to 55% not 40% — no comfort benefit below 55% in crawl
Saves 30-40%
- 3
Use continuous drain — bucket-based wastes energy cycling
Stable operation saves 10-20%
Real-world wattages
Pulled from actual spec sheets.
| Brand | Model | Watts |
|---|---|---|
| Aprilaire | E100 100-Pint | 590W |
| Santa Fe | Advance90 | 680W |
| Honeywell | TP70WKN | 525W |
Picks that actually move the needle
Three products worth comparing if you're thinking about upgrading or supplementing what you have.
Some links below are affiliate links. If you buy, we may earn a small commission — it never changes the price you pay, and we only recommend picks we would stand behind.
See also
Related appliances
Sources: www.energystar.gov · www.energy.gov
Last updated: 2026-04-13