What Size Dehumidifier Do I Need?
Explore a capacity range for your room conditions
Quick Answer
Current ENERGY STAR guidance groups portable dehumidifiers by room size and moisture condition and gives capacity ranges rather than an exact universal prescription. Capacity is rated in pints removed per 24 hours under specified test conditions. Older ratings tested at 80°F and newer ratings tested at 65°F are not directly comparable, so compare the current label or manufacturer data for the exact model.
Electricity rates: U.S. EIA, May 2026
WattItCost is an independent appliance energy-cost calculator project.
Citation-ready summary
Summary
Current ENERGY STAR guidance groups portable dehumidifiers by room size and moisture condition and gives capacity ranges rather than an exact universal prescription. Capacity is rated in pints removed per 24 hours under specified test conditions. Older ratings tested at 80°F and newer ratings tested at 65°F are not directly comparable, so compare the current label or manufacturer data for the exact model.
Formula
Cost = (watts ÷ 1,000) × hours used × electricity rate per kWh.
Data used
Calculator results use user-entered wattage and usage hours, combined with residential electricity rates for the selected U.S. state or the rate entered from a utility bill.
Sources
EIA data period: May 2026EIA source release date: WattItCost site update date:
Limits
These estimates do not reproduce a utility bill. Actual costs depend on your tariff, taxes, appliance cycling, efficiency, and how you use the appliance.