Buying guide
How to Choose a Dehumidifier
Reviewed by
Dr. Yocheved Yorkovsky · Science Editor, Health, Chemistry & Environment
Capacity, drainage, noise, cold-weather performance — in that order. Here's how to size a dehumidifier to your space and read past the marketing.
Match a dehumidifier to my room →Capacity and pricing data checked July 2026.
The four questions, in order
Every dehumidifier decision comes down to four things, and they are not equally important. In order: how much water it can pull, how you'll get that water out, how much noise you'll tolerate, and whether the room ever gets cold. Get those right and the rest is detail.
1. Capacity — and the pint number that lies
Since 2019, US dehumidifiers have been rated under a cooler DOE test (65°F/60% RH, instead of the old 80°F). Cooler air holds less moisture, so the same machine extracts less during the test and posts a lower number. An old 70-pint is today's 50-pint. Nothing changed but the yardstick — the full story is in 35-pint vs 50-pint.
Worse, some brands quote capacity at 95°F and 90% relative humidity — a hot, saturated condition no home ever experiences — to produce a flattering "MAX pint" figure. A unit advertised at "80 MAX pints" can be a 32-pint under the DOE standard. If a pint number isn't labelled with its test condition, treat it as marketing, not a spec.
Size by space and dampness — our sizing chart has the detail. As a baseline: a moderately damp room up to ~1,500 sq ft wants a 20–35-pint; a damp basement or up to ~2,500 sq ft wants a 50-pint.
And when in doubt, size up. Capacity is the cheapest thing you can buy in this category: our pints-per-dollar study found the largest units deliver 83% more water per dollar than the smallest.
Quick picks, with comparable data
| Dehumidifier | Capacity (2019 DOE) | Drainage | PickGrade take |
|---|---|---|---|
| Frigidaire FHDD5034 | 49.7 pints/day | Gravity hose | Best capacity per dollar. The default, if you can drain downhill |
| Midea Cube 50 | 50 pints/day | Built-in pump | The only one that drains uphill to a sink. Best overall |
| Midea Cube 35 | 35 pints/day | Gravity hose | Quiet, huge tank, for a normal damp room |
| Midea Cube 20 | 20 pints/day | Gravity hose | The quietest small unit. Bedrooms |
| Waykar 34 | 34 pints (at 95°F/90%) | Gravity hose | Cheapest capable unit — but note the flattering test condition |
| Ivation IVADDH06 | 12 pints/day (desiccant) | Gravity hose | Works to 33°F, where compressors quit |
2. Drainage — the thing you'll actually live with
This is the biggest day-to-day difference, and the one buyers most often get wrong. You have three options.
Empty a tank by hand. Fine for a small room — but check the numbers before you commit. We divided every unit's tank size by its daily capacity and found a nearly eightfold spread in how often you'll empty it: the Cube 20 runs over a day between empties; the Waykar fills in under four hours.
Run a gravity hose. Set-and-forget — but only if a floor drain or sink sits below the unit, with a continuous downhill run and no dips.
Use a built-in pump. This actively lifts water up and out to a higher sink or window. Only the Midea Cube 50 has a genuine one, and in a basement with no low drain it is the whole ballgame.
3. Noise
Compressors cycle on and off, and it's that clunk — not the raw decibel figure — that wakes light sleepers. For a bedroom, prioritise a quiet unit like the Cube 20. For a basement or garage, noise barely matters and you should buy on capacity and price instead.
4. Temperature
Standard compressors lose efficiency as a room cools and lean on a defrost cycle; below about 40°F they mostly give up. For a cold garage or crawl space, a desiccant is the right technology — the Ivation pulls 11.8 pints a day at 41°F where a compressor manages under three.
The part nobody tells you: running cost
Here's the honest downside of this whole category. A dehumidifier is one of the hungrier appliances in a house — often more expensive to run than a fridge. A 50-pint unit draws around 500 watts; run it 12 hours a day and you're looking at roughly $34 a month, and about $68 if it runs continuously.
The fix is free: set the humidistat to 45–50% instead of leaving it in continuous mode, and let it cycle off when it hits target. That alone can halve the bill. The full math is here.
Watch and verify
- Midea Cube dehumidifier review and setup — the pump and the collapsible tank in use
- Frigidaire FHDD5034 review — hands-on with our value pick
Sources
- ENERGY STAR: dehumidifier testing and capacity — the 2019 DOE standard
- EPA: mold and moisture guidance — the 30–50% relative humidity target
- DehumidifierBuyersGuide — independent hands-on capacity and noise testing
Bottom line
Size to the space and the dampness, then let drainage decide the model: a low drain means the Frigidaire is the value answer, no low drain means the Cube 50's pump earns its premium, and a cold room means neither — you want a desiccant. If you'd rather not weigh all four yourself, the 60-second quiz gates by space, dampness, drainage, noise, and budget and tells you which unit survives.
Frequently asked
What size dehumidifier do I need?
Match capacity to space and dampness: a 20–35-pint suits a moderately damp room up to ~1,500 sq ft, a 50-pint a damp basement or up to ~2,500 sq ft. Post-2019 pint labels are about 30% lower than old ones for the same performance, so size up if you're unsure.
Do I need a dehumidifier with a pump?
Only if you can't drain downhill. A gravity hose works when a floor drain or sink sits below the unit; a built-in pump lifts water up to a higher sink or out a window. Of the units we rank, only the Midea Cube 50 has a genuine built-in pump.
What humidity level should I aim for?
The EPA recommends keeping indoor relative humidity below 60%, ideally 30–50%. That band discourages both mold and dust mites without drying the air enough to irritate your sinuses.
Are dehumidifiers expensive to run?
They're among the hungrier home appliances. A 50-pint unit draws about 500W; running 12 hours a day costs roughly $34 a month at the US average electricity rate, or about $68 running continuously. Using the humidistat rather than continuous mode can halve that.
What does 'MAX pint' mean on a dehumidifier box?
It means the capacity was measured at 95°F and 90% relative humidity — a hot, saturated condition no home ever sees. It produces a much larger number than the real 2019-DOE rating. A unit sold as '80 MAX pints' can be a 32-pint under the actual standard.
Will a regular dehumidifier work in a cold garage?
Not well. A compressor condenses moisture on a cold coil, which frosts over as the room approaches 40°F, so the unit spends its time defrosting instead of drying. Cold spaces need a desiccant, which works down to about 33°F.