Best Dehumidifier for a Bedroom
A bedroom unit runs a few feet from someone trying to sleep, so the noise figure matters as much as the pint rating. Perfect Aire is the only compressor maker here that publishes both.
My pick for a bedroom is the Perfect Aire 3PFD22. It removes 22 pints a day, which covers a slightly to moderately damp room on ENERGY STAR’s sizing table, and Perfect Aire’s spec sheet puts it at 46.5 dB on low. Choose the Whirlpool WHAD251AW if you want the more efficient machine and a Sleep mode; it is the only one of the three that meets ENERGY STAR’s Most Efficient criteria, but Whirlpool’s manual gives no decibel figure. The SPT mini suits a closet or a small, warm room: it is a thermoelectric unit that pulls about two-thirds of a pint a day in its maker’s test, and almost nothing below 59°F.
The room smells musty, the windows sweat, or a hygrometer reads over 60 percent. EPA’s mold guidance says to keep indoor humidity below 60 percent, ideally between 30 and 50.
You can empty a bucket every day or two, or a drain sits close enough for a hose.
The bedroom is in a damp basement. A 35-pint unit from the basement roundup has more capacity, and the Hisense there is rated down to 38°F.
You want to dry the whole apartment with one machine; the apartment guide covers that.
| Perfect Aire 3PFD22 | Whirlpool WHAD251AW | SPT SD-300ML mini | |
|---|---|---|---|
| Best for | Most bedrooms | Efficiency, Sleep mode | Closets, small warm rooms |
| Advisor Score | 3.0 | 3.0 | 2.3 |
| Water removal | 22.3 pints a day at 65°F | 24.8 pints a day at 65°F | 0.63 pints a day at 86°F, 80% RH (maker) |
| Noise | 46.5 dB low, 52 dB high (maker sheet) | Not in Whirlpool’s manual | 46 dB (maker) |
| Rated coverage | 1,500 sq ft | 1,500 sq ft (maker figure via Sylvane) | 130 sq ft |
| Lowest rated operating temperature | 41°F | 41°F | 41°F; little output below 59°F |
| Bucket | 6.3 pints | Not in Whirlpool’s manual | 600 mL (about 1.3 pints) |
| Drain port | Yes, hose not included | Yes, hose not included | No |
| Size (W x H x D) | 15.5 x 19.75 x 10.25 in | 12.2 x 19.7 x 9.0 in (Sylvane) | 5.75 x 8.94 x 5.75 in |
| ENERGY STAR yearly energy | 278 kWh | 283 kWh | Not certified |
| Warranty | 1-year full replacement | 1 year, parts and labor | 1 year |
| Buy | Perfect Aire 22-pint at Sylvane, $219.00 | Whirlpool 25-pint at Sylvane, $229.99 | SPT mini at Sylvane, $44.95 |
How much capacity a bedroom needs
ENERGY STAR’s sizing table starts at 20 to 30 pints a day for a slightly to moderately damp space under 2,000 square feet, and a bedroom sits at the small end of that band. The two compressor units here land in it: ENERGY STAR measured the Perfect Aire at 22.3 pints and the Whirlpool at 24.8 on the Department of Energy’s 65°F test. Their makers round those to 22 and 25. A 35-pint unit would also fit, but it is a bigger cabinet to put next to a bed, and none of the 35-pint units I have reviewed comes with a published decibel figure.
Perfect Aire 3PFD22
Perfect Aire’s spec sheet lists 46.5 dB on the low fan and 52 on high; the product page says 51 on high, a small gap of its own. Neither says how far from the unit it was measured, so the figures compare its own fan settings better than they compare brands. Run it on low at night and on high during the day if the room needs catching up.
It is a flat panel unit, 10.25 inches deep, so it sits against a wall without much sticking out. The bucket holds 6.3 pints. At its full rated output that fills in about seven hours, though a bedroom that is only somewhat damp gives up far less water than the rating. A drain port takes a garden hose if a drain is handy, and the unit shuts off when the bucket is full.
Perfect Aire backs it with a one-year full replacement warranty. Its ENERGY STAR factor is 1.70 liters per kWh, the lower of the two compressor units, so each pint costs slightly more to remove than on the Whirlpool.
Whirlpool WHAD251AW
XLS Products builds this unit under the Whirlpool name, and its manual lists a Sleep mode alongside Dry and Laundry, three fan speeds, and an automatic restart at the previous settings after a power cut. ENERGY STAR rates it at 1.85 liters per kWh and lists it as meeting its Most Efficient criteria; the Perfect Aire does not.
Whirlpool’s manual gives no decibel figure. Sylvane’s listing gives two that disagree: 43 dB on low and 47 on high in the description, and 51 as the maximum in its spec table. The same listing also gives two bucket sizes, 11 and 8.5 pints. Without a maker figure, I rank it behind the Perfect Aire for a room where someone sleeps.
At about 9 inches deep in Sylvane’s measurements, it is the slimmer of the two compressor units. The warranty is one year on parts and repair labor, through an XLS-designated service company.
SPT SD-300ML mini
The SPT has no compressor; a thermoelectric plate cools the air, and SPT rates it at 300 mL a day, about 0.63 pints, at 86°F and 80 percent humidity. SPT’s own page says output is nearly zero below 59°F. I’d use it in a closet.
It draws 23 watts, stands under 9 inches tall, weighs 1.9 pounds and shuts off when its 600 mL tank is full. There is no drain port, so you empty the tank by hand. SPT lists it at 46 dB, also with no measuring distance.
Running cost
At the August 2026 US average of 18.16 cents per kWh (EIA), ENERGY STAR’s yearly estimates come to about $50 for the Perfect Aire and $51 for the Whirlpool. Per pint, the Whirlpool’s higher factor works out to about 4.6 cents against about 5.1 for the Perfect Aire; its slightly higher yearly figure comes from removing more water, 24.8 pints a day to 22.3. The SPT draws 23 watts whether the air is damp or not, about 10 cents a day running around the clock, for well under a pint of water.
How the Advisor Scores compare
The Perfect Aire and the Whirlpool tie at 3.0: each scores 4 for its 41°F rating, 2 for 1,500 square feet, 3 for drainage (a port, but no hose in the box and a bucket well under 3 gallons; both of Sylvane’s Whirlpool figures are under 1.5 gallons), and 3 for a one-year warranty. The score doesn’t count noise or efficiency. I break the tie on noise disclosure, a judgment the score doesn’t make: in a bedroom I’d rather have a maker’s figure than a better efficiency rating. The SPT scores 2.3: 4 for its rated 41°F, though SPT says output is near zero below 59°F, then 1 for 130 square feet, 1 for having no drain port, and 3 for its warranty.
Will it overflow if it runs overnight?
The Perfect Aire and the SPT shut off when their bucket is full; Whirlpool’s manual doesn’t say, so check the bucket before bed the first few nights. EPA’s guidance puts indoor humidity between 30 and 50 percent; the Whirlpool’s setting runs from 35 to 80, so 35 to 50 sits inside that band.
Will a mini dehumidifier work in a bedroom?
Not in one that feels damp. The compressor units here pull more than 20 pints a day at 65°F; the SPT’s section above has its numbers.
Perfect Aire for the bedroom, SPT for the closet
For a bedroom, I’d buy the Perfect Aire 3PFD22: its 22 pints sit inside ENERGY STAR’s 20 to 30 pint band, and it is the only compressor unit here with a maker’s low-fan noise figure. If Whirlpool publishes decibel figures for the WHAD251AW and they come in quiet, its better efficiency and Sleep mode would make it the stronger buy. For a closet, the SPT mini is the low-cost option in the table.
Specifications come from Perfect Aire’s spec sheet and product page, the Whirlpool WHAD251AW owner’s manual (XLS Products), and SPT’s product page and manual, checked against Sylvane’s listings in November 2026. Capacity, energy factors and yearly energy come from ENERGY STAR’s certified product data; the electricity price is from the U.S. Energy Information Administration (August 2026, preliminary). This page contains affiliate links. If you purchase through these links, Dehumidifier Advisor may earn a commission at no additional cost to you. See our affiliate disclosure for details.