Guide
Is a Dehumidifier Worth It?
Sometimes emphatically yes, sometimes it is the most expensive way to avoid fixing a gutter. The reading on a cheap hygrometer tells you which situation you are in.
By Scooter M. · Published · Last updated
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The short answer
Worth it above 60% relative humidity with no liquid water arriving. Not worth it otherwise. The EPA recommends keeping indoor humidity below 60 percent, ideally 30-50 percent. If a room reads above that band and the moisture is coming from the air rather than through a wall, a dehumidifier does exactly the job and nothing else will. If the reading is already inside the band, or if water is entering the structure, it is a running cost with no destination.
Answer the question for $12 before you spend $200
This entire decision turns on one number you probably do not have. A hygrometer is the cheapest device on this site and it is the only one that tells you whether any of the others are necessary. Put one in the room that worries you and one somewhere you consider normal, and read them for a week.
- Above 60% persistently: you are outside the EPA’s recommended range and in conditions that support mold growth. A dehumidifier is worth it - go to the next section to check why it is high.
- 50-60%: under the ceiling, but dust mites do well here and condensation on cold surfaces becomes likely. Free measures usually get you inside the band.
- 30-50%: the EPA’s stated ideal. A dehumidifier has nothing to do. If you still have a symptom, the cause is not humidity.
What it costs to be worth it
A dehumidifier is one of the larger electrical loads in a house and it often runs for months. That is the side of the ledger the listings do not show, so here is the arithmetic we use everywhere on this site: watts / 1000 x hours per day x 365 x your electricity rate. At 18.34 cents per kWh - the US average residential price published by the Energy Information Administration - a 345 W unit cycling in a basement works out at roughly $115 a year, and a 545 W 50-pint unit at roughly $180-200. Where a manufacturer publishes no wattage, ENERGY STAR’s certified annual kWh figure is the better basis - we use it to cost out specific models in energy efficient dehumidifiers.
Set against that: it is a machine that keeps a space inside a band the EPA explicitly recommends, in a room you otherwise could not use. For a basement that smells musty every summer, that is straightforwardly worth it. For a bedroom that reads 55%, it is $115 a year to change a number that was already acceptable.
Six times it is worth it
- A basement that reads above 60% for months. The clearest yes in the category.
- A musty smell that returns within a day of airing. The smell is the growth; the growth needs the moisture.
- Condensation on windows every morning that no amount of ventilation fixes, usually in winter.
- Stored belongings you care about - instruments, tools, documents - in a space you do not heat.
- Laundry you have no choice but to dry indoors. It is the largest avoidable indoor moisture source, and where it is unavoidable a dehumidifier is the honest answer.
- A room the air conditioning does not reach, which is most basements - the two machines are compared at dehumidifier vs air conditioner.
Five times it is not
- The reading is already 30-50%. Nothing to remove.
- Water is entering through the structure. The EPA’s guidance is that wet materials dried within 24-48 hours mostly will not grow mold - that is about drying speed after a specific event, not about owning an appliance forever.
- You have not tried the free measures. Extractor fans, not drying laundry indoors, moving furniture off external walls, and ventilating when outdoor air is drier all move the number for nothing: how to lower humidity.
- The problem is a smell rather than moisture. A dehumidifier is not an odor device. If the smell is smoky or chemical rather than musty, you want carbon, not a compressor.
- You are trying to fix mold you can see. Lowering humidity stops it spreading; it does not remove what has grown, and the EPA notes dead mold still needs physically removing.
What about the cheap moisture absorbers?
Tubs of desiccant and small thermoelectric units are a genuinely different product class rather than a budget version of the same thing. They manage dampness in a wardrobe, a safe or a caravan, and they will not touch a room. We put the scale question side by side in dehumidifier vs DampRid and in best budget dehumidifiers.
What we would actually do
Buy the hygrometer first - it is the cheapest thing on this site and it either justifies the purchase or saves you it. If the room sits above 60% for a week, do the free measures for another week and read it again. If it is still above 60% and there is no liquid water arriving, buy a unit sized to the room rather than the biggest one on the shelf, set it to 50%, and treat the annual electricity as the real price of the machine.
What we would buy for this
Chosen from the same registry as our roundups, on published specifications and computed running cost.
Govee H5075 Bluetooth Hygrometer
Diagnosing a problem that changes overnight
The one that logs. If your problem is that the house is dry at night but fine during the day, a hygrometer you have to walk over and read will never tell you that.
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Published specifications
| Specification | Value | Source |
|---|---|---|
| Function | Bluetooth temperature and humidity sensor with app-based logging and data export | Govee published specification |
What is good about it
- Logging is the feature. Overnight humidity swings are invisible to a spot reading, and they explain most morning symptoms
- Data export means you can check whether the humidifier actually changed anything, rather than assuming
What is not
- Bluetooth range is room-scale; a basement sensor will not reach a phone upstairs
- Requires an app and an account, which is a genuine cost for some people
Who should skip this
Skip this if you just want a number on a wall. The logging is the whole premium, and it is wasted if you will not look at it.
How it scored
- Logging and history9.5
- Value for the decision it informs9.0
- Range and placement freedom6.0
Overall 8.6 / 10. This is our editorial score from published specifications and computed running cost. It is not a test result, and it is deliberately not marked up as a rating in this page’s structured data.
Midea Cube 20-Pint
Bedrooms and single rooms up to about 1,500 sq ft
The smaller Cube, and the right size for a bedroom. Most people buying a bedroom dehumidifier buy far too much capacity and then run it on a setting that never cycles down.
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Published specifications
| Specification | Value | Source |
|---|---|---|
| Capacity | 20 pints per day | Midea published specification |
| Capacity (federal test) | 20.16 pints per day | ENERGY STAR certified products database |
| Coverage | Up to 1,500 sq ft | Midea published specification |
| Efficiency (IEF) | 1.70 L/kWh | ENERGY STAR certified products database |
| Annual energy use | 249 kWh/yr | ENERGY STAR certified products database |
| Bucket fill level | Adjustable, up to 3 gallons | Midea user manual |
| Fan speeds | 2 (High, Low) | Midea user manual |
| Certification | ENERGY STAR certified | ENERGY STAR certified products database |
What it costs to run
About $46 a year on ENERGY STAR's certified annual energy figure.
ENERGY STAR publishes 249 kWh a year for this model. At 18.34 cents/kWh that is $45.67 a year. That figure is calculated on the program's standardized test basis, not measured in your room: a damp space where it cycles constantly will use more, a mildly damp one on a 50% setpoint less.
What is good about it
- 20 pints is the capacity a single closed bedroom actually calls for, so the compressor cycles off instead of running flat out
- The nested/extended body stores smaller than it runs, which matters for a machine you only want out for half the year
- ENERGY STAR certified, with the lowest annual energy figure of the three Cube sizes
What is not
- The least efficient Cube per unit of water removed: an IEF of 1.70 L/kWh against 2.01 for the 35 and 50-pint models
- Midea does not publish a rated wattage or a noise figure for this model, so we quote ENERGY STAR's certified annual energy figure instead of a wattage
- 1,500 sq ft is a coverage ceiling measured under favorable conditions, not a promise about a damp bedroom
- A compressor unit still makes compressor noise; if silence matters more than capacity, this is the wrong category
Who should skip this
Skip this if the room is a closet, a safe or a caravan - that is a job for a desiccant or thermoelectric unit, not a compressor. And skip it for a genuinely wet basement, where 20 pints will run continuously and never win.
How it scored
- Right-sized for one room9.5
- Efficiency per liter removed7.0
- Storage and handling9.0
Overall 8.3 / 10. This is our editorial score from published specifications and computed running cost. It is not a test result, and it is deliberately not marked up as a rating in this page’s structured data.
Midea Cube 35-Pint
Basements without a floor drain
The adjustable 4.25-gallon bucket is the point. Most dehumidifiers get switched off because emptying a 2-gallon bucket twice a day is miserable; this one buys you a couple of days.
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Published specifications
| Specification | Value | Source |
|---|---|---|
| Capacity | 35 pints per day | Midea published specification |
| Capacity (federal test) | 35.82 pints per day | ENERGY STAR certified products database |
| Coverage | Up to 3,500 sq ft | Midea published specification |
| Efficiency (IEF) | 2.01 L/kWh | ENERGY STAR certified products database |
| Annual energy use | 378 kWh/yr | ENERGY STAR certified products database |
| Bucket fill level | Adjustable, up to 4.25 gallons | Midea user manual |
| Fan speeds | 2 (High, Low) | Midea user manual |
| Dimensions | 14.76 x 14.57 x 14.45 in, 39.62 lb | Midea published specification |
| Certification | ENERGY STAR certified | ENERGY STAR certified products database |
What it costs to run
About $69 a year on ENERGY STAR's certified annual energy figure.
ENERGY STAR publishes 378 kWh a year for this model. At 18.34 cents/kWh that is $69.33 a year. That figure is calculated on the program's standardized test basis, not measured in your basement: a genuinely damp space where it cycles constantly will use more. Against the 50-pint Cube's 515 kWh ($94.45) it is the cheaper machine to own, which is the argument for sizing honestly rather than buying headroom.
What is good about it
- An adjustable bucket that holds up to 4.25 gallons - the difference between a unit you keep using and one you unplug in week three
- An IEF of 2.01 L/kWh removes about 18% more water per kWh than the 20-pint Cube's 1.70
- Nests down into a smaller shape for storage, which matters for an appliance you only use half the year
What is not
- The 3,500 sq ft coverage claim assumes conditions no real basement has; treat it as a ceiling, not a specification
- 35 pints is not enough for a genuinely wet basement with standing water
- Midea does not publish a rated wattage for this model, so we quote ENERGY STAR's certified annual energy figure instead
- No built-in pump on this model - without a floor drain you are either emptying the bucket or routing a gravity hose
Who should skip this
Skip this if your basement is wet rather than damp - visible water, white efflorescence on the walls, a musty smell that returns within a day of airing out. That is a drainage problem, and a 35-pint unit will run permanently and never win.
How it scored
- Tank interval10.0
- Capacity for the money8.5
- Efficiency per liter removed9.0
- Storage footprint9.0
Overall 8.7 / 10. This is our editorial score from published specifications and computed running cost. It is not a test result, and it is deliberately not marked up as a rating in this page’s structured data.
How we ranked these
We have not tested these units. Nobody here owns one. What we did was compile each manufacturer’s published specifications, check the coverage claims against AHAM’s room-sizing rule, and compute what each one costs to run for a year at the current US average electricity price. Every figure on this page is attributed to whoever published it, and the arithmetic is shown so you can redo it.
How we rank these sets out the full method, including what would change a ranking.
Questions people ask
+−Is a dehumidifier worth the electricity?
Above 60% relative humidity with no liquid water arriving, yes - it is the only device that fixes that, and it keeps the room inside a band the EPA explicitly recommends. At roughly $115 a year for a cycling 345 W unit, it is not worth it to change a reading that is already inside 30-50%.
+−How do I know if I need a dehumidifier?
Measure. A hygrometer costs a fraction of a dehumidifier. Persistently above 60% in a room where no liquid water is entering is the case where one is clearly worth buying.
+−Will a dehumidifier get rid of a musty smell?
It removes the condition the growth depends on, which is what ends the smell over time. It does not remove growth that already exists, and it does nothing if water keeps arriving through a wall or a failed gutter.
+−Is it cheaper to run a dehumidifier or the air conditioning?
They are not doing the same job, so watts alone will not answer it. An air conditioner removes heat as well as moisture and answers to a thermostat; a dehumidifier answers to a humidistat and returns its heat to the room.
+−Can a dehumidifier replace fixing a leak?
No, and it is the most expensive way to avoid the repair. Against liquid water arriving it runs continuously and the material stays wet.