Cooling · South Carolina
How Much Does It Cost to Run a Dehumidifier in South Carolina?
The short answer
Running a 500W dehumidifier in South Carolina costs about $0.08 an hour. At 8 hours a day, that’s roughly $18.82 a month and $226 a year.
South Carolina’s average residential rate was 15.5¢ per kWh in July 2026 (EIA), 16% below the US average.
Source: U.S. EIA, July 2026 data · Updated
Dehumidifier cost by daily use in South Carolina
| Daily use | kWh/month | Per day | Per month | Per year |
|---|---|---|---|---|
| 1 hour/day | 15.2 | $0.08 | $2.35 | $28.23 |
| 2 hours/day | 30.4 | $0.15 | $4.71 | $56.47 |
| 4 hours/day | 60.8 | $0.31 | $9.41 | $113 |
| 8 hours/day | 121.7 | $0.62 | $18.82 | $226 |
| 12 hours/day | 182.5 | $0.93 | $28.24 | $339 |
| 24 hours/day | 365.0 | $1.86 | $56.47 | $678 |
South Carolina vs other states
At typical use, a dehumidifier costs $226 a year in South Carolina — $475 less than in Hawaii and $40.15 more than in Louisiana.
South Carolina has the 20th-cheapest residential electricity of the 50 states and DC. electricity prices in South Carolina · all states ranked
Electricity price trend in South Carolina
15.5¢/kWh in July 2026 — ▲ +5.2% from a year earlier.
How to lower the cost of running a dehumidifier
Dehumidifiers work like small air conditioners, using a compressor to condense moisture out of the air. Most home units draw 300–700W depending on capacity, and the humidistat switches the compressor off once the room reaches the target humidity. Basements in humid climates may need several hours a day in summer. ENERGY STAR models remove noticeably more water per kWh.
- Set the humidistat to 45–50% — lower settings make it run much longer for little benefit.
- Keep doors and windows closed in the room being dehumidified.
- Clean the filter and coils regularly so the compressor works efficiently.
Questions
Frequently asked questions
How much does it cost to run a dehumidifier for 24 hours in South Carolina?
Running a 500W dehumidifier for 24 hours uses about 12.0 kWh, which costs about $1.86 at South Carolina’s average rate of 15.5¢/kWh.
How many kWh does a dehumidifier use per month?
At 8 hours a day, a typical dehumidifier uses about 122 kWh a month. In South Carolina that costs $18.82.
Is it expensive to run a dehumidifier in South Carolina?
South Carolina has the 20th-cheapest residential electricity of the 50 states and DC at 15.5¢/kWh — cheaper than most. Running a dehumidifier here costs about $226 a year at typical use, compared with $267 at the national average rate.
What is the electricity rate in South Carolina right now?
The average residential electricity rate in South Carolina was 15.5¢ per kWh in July 2026, according to the latest EIA data — up 5.2% from a year earlier.
Should I run my dehumidifier 24 hours a day?
Usually not. Set the humidistat to 45–50% and let it cycle on its own; it will only run as long as needed to hold that level.
Dehumidifier costs in nearby states
Other appliances in South Carolina
Cheapest and priciest states
Sources & method
- Electricity rates: U.S. Energy Information Administration, Electric Power Monthly — average residential retail price, July 2026 (latest available). Retrieved .
- CO₂: EIA State Electricity Profiles, 2024 emissions rate of in-state power generation.
- Default usage for dehumidifier: 8 hours a day. Typical power 500W.
- Formulas, duty cycles and limitations: methodology. Data download: open data (CC BY 4.0).