Updated 3 min read
Photo: Peltier dehumidifier Maxton — Shtyrmovik, CC BY-SA 4.0. Wikimedia Commons.
Running a dehumidifier daily can help maintain comfortable indoor humidity levels, but it also adds to your electricity bill. To estimate the monthly cost of running a dehumidifier, you need to know the unit's efficiency rating, the tariff for electricity, and the actual runtime in your home.
The key metric for dehumidifier efficiency is the Integrated Energy Factor (IEF), which measures litres of water removed per kilowatt-hour of energy consumed. In the U.S., ENERGY STAR sets minimum efficiency thresholds for portable dehumidifiers at 1.70 L/kWh for units up to 25 pints/day, 2.01 L/kWh for 25.01 to 50 pints/day, and 3.30 L/kWh for units 50 pints/day and above.
Dehumidifier efficiency is measured in litres of water removed per kilowatt-hour of energy consumed. The ENERGY STAR program's Integrated Energy Factor (IEF) rating gives a sense of how much water can be removed per unit of energy. This helps compare models, but actual performance depends on your specific room conditions and usage.
A 2026 Canadian study showed that a unit with an IEF of 1.2 L/kWh can remove 10 litres for every dollar spent at 12¢ per kWh, while a unit with 2.4 L/kWh can remove 20 litres. However, these represent theoretical best-case scenarios, not typical performance. In practice, you should consider real-world duty cycles and room variables.
Actual electricity consumption depends on more than just the dehumidifier's power draw: it also depends on efficiency, runtime, and daily temperature and relative humidity. As an example of variability in efficiency: Metrics for compressor and desiccant machines given in one source, a 2026 Descent Analysis study, span 2.0–2.5 litres per kWh for compressor at 80°F, 60% RH, and 0.8–1.2 L/kWh for desiccant, but these are again not averages or typical operation.
As a rough rule of thumb, compressor units are more efficient in warm, damp conditions, while desiccants tend to perform better at lower temperatures. But no technology works well in all cases. For instance, compressor performance can degrade significantly at 60°F (15°C) and below, at which point the evaporator coil has to work much harder to maintain moisture removal.
Monthly electricity costs depend on your machine's efficiency, run time, and electricity tariff. Given: -]
Putting these into the formula, answer will vary by:
The big divide in machine type is between compressor and desiccant machines. Compressor units work by passing air over a series of coils, and tend to use AC refrigerant technology. Desiccant machines use desiccating agents, and are more efficient in certain conditions. They are not usually the go-to machine, because of their higher startup cost and use case (basements where compressor systems don't work well).
If the math shows that a dehumidifier would be prohibitively expensive for your humidity problem, look beyond the machine itself. Find and fix leaking roofing, foundation, and structural elements; install exhaust fans where moisture accumulates; and ensure air circulation to maintain even temperatures and humidity. This section should steer the audience to credible primary sources for moisture control in everything from a small trailer to a large home. It should rest heavily on the trade-off between specific porosity materials and water repellents, framing these as precision tools.
In addition to sourcing, substantively it should nail three factors
Filter pitcher owners know a replacement filter is an unusual product — one where buying a new one is concealed as an ongoing maintenance manual, in effect giving the manufacturer a chance…
Updated 4 min read
Choosing a new vacuum often leads homeowners down a rabbits' hole of acronyms and metrics: Pa, AW, "suction power," hardware specs, and conflicting reviews. While choosing between a stick…
Updated 5 min read
A 1,500-watt heater costs the electricity rate times 1.5 kWh per hour, and all electric resistance heaters are 100-percent efficient to run.
Updated 3 min read