How to Choose a Dehumidifier for a Damp Basement, Bathroom or Bedroom

Match the machine to the room

A dehumidifier is only one part of keeping a room dry. The EPA's mold guidance says to keep indoor humidity below 60 percent, ideally between 30 and 50 percent. ENERGY STAR gives the same 30 to 50 percent target and suggests 30 to 40 percent during the heating season to prevent condensation on windows. Measure before you buy. The EPA says a humidity meter costs about $10 to $50 at many hardware stores.

Basements are where a full-size compressor dehumidifier usually earns its place: they tend to be large and cool, and some have seepage. Bedrooms add a noise requirement, because the unit may run all night. Bathrooms are the exception. HouseFresh does not recommend dehumidifiers for bathrooms. It cites Wirecutter's concern about electrical shock risk and suggests exhaust fans, open windows or open doors instead. The EPA's main bathroom advice is also to run a fan or open a window, especially while showering.

Deal with moisture sources where you can. ENERGY STAR suggests extending downspouts away from the foundation, keeping gutters clear, making sure soil slopes away from the house, venting clothes dryers outdoors and using bathroom and kitchen exhaust fans.

Sizing: read the pint rating correctly

Capacity is listed in pints of water removed per 24 hours. ENERGY STAR's recommended minimums for portable units are: 20 to 30 pints for slightly to moderately damp spaces (50 to 75 percent humidity) under 2,000 sq ft; 25 to 40 pints for very damp spaces (75 to 90 percent); and 30 to 50 pints for wet spaces (90 to 100 percent, including rooms where laundry dries). Add capacity for larger areas. When replacing a unit, ENERGY STAR suggests estimating the capacity you need from how much water you empty each day.

Be careful when comparing labels from different years. Consumer Reports explains that the Department of Energy lowered the test room temperature from 80°F to 65°F, with humidity unchanged at 60 percent. As a result, models sold since early 2020 usually claim 20, 30 or 45 pints, where older models claimed 30, 50 or 70. CR says the lower figures don't mean the new models remove less water, and notes that the old numbers still appear in some model names. Only compare spec-sheet figures measured under the same standard.

Sources disagree on oversizing. ENERGY STAR says it is better to oversize than undersize, and Consumer Reports and Reviewed both favor a somewhat larger unit. Reviewed adds that an undersized machine runs almost constantly, which strains the compressor and fan. HouseFresh warns against oversizing because extra capacity raises electricity costs. A practical middle path: size for how damp the space actually is. CR's rule of thumb is that a unit that never shuts off is probably too small.

What is worth paying for

These features make the most difference for basements and bedrooms:

• Easy drainage: Consumer Reports says every model in its ratings can drain through a hose to a floor drain. It calls a pump the most hassle-free option, and a pump can push water up to a sink or window. CR also notes that tanks under 15 pints need emptying more often.

• Low-temperature operation for cool basements: ENERGY STAR warns that frost can form on the coils below 65°F and suggests a model rated for lower temperatures or one with an anti-frost sensor. Reviewed reports the Hisense DH7021K1W runs down to about 38°F.

• A humidistat you can set to a specific percentage: all ENERGY STAR models have one, and CR tests how closely units reach and hold the level you set.

• ENERGY STAR certification: ENERGY STAR says certified units use about 20 percent less energy than comparable conventional models. Compare the integrated energy factor (liters per kWh); higher is better.

• Auto-restart after a power cut: CR says most models it has tested have it.

• Low noise for bedrooms: CR measures from 3 feet and reports results from the low 50s to the upper 60s in decibels. For comparison, it puts normal conversation at about 60.

What to skip or think twice about

Mini thermoelectric (Peltier) units. HouseFresh says they cost about $50 to $80 and calls them too weak for basements. In its basement tests, one such unit struggled to bring humidity down to 63 percent. Reviewed is more positive about very small spaces: it reports that the Eva-Dry EDV-1100, rated at 8 oz a day, kept a 150 sq ft bathroom about 5 to 10 percent drier, but only with the door closed. That suits a small problem, not a damp basement.

Built-in pumps, if you have a floor drain. HouseFresh's author prefers a gravity hose and says internal pumps break more often. Reviewed notes that a pump adds significantly to the price. A pump is worth it mainly when there is no drain at floor level.

Paying extra for Wi-Fi. Reviewed sees app control as useful for spaces you rarely visit, but it rated the smart-featured Frigidaire Gallery only average at lowering humidity. Treat an app as a convenience, not a sign of better performance.

A whole-home system without a clear need. ENERGY STAR says these suit humid climates with central air conditioning, especially in fairly well-sealed homes where humidity stays above 55 percent, and recommends having an HVAC professional size and install one.

Price tiers (as listed in November 2026)

These are retailer prices shown in Reviewed's guide (updated April 2026) and in Consumer Reports' and HouseFresh's guides when viewed in November 2026. Dehumidifier prices change often.

• Around $15 to $25: renewable desiccant units for closets, such as the Eva-Dry E-333. Reviewed says it lowered a closet's humidity from about 60 to 50 percent over a week.

• Around $50 to $80: Peltier mini units (HouseFresh's range), including the Eva-Dry EDV-1100 at around $60 to $65. Only for very small rooms.

• Around $260 to $310: mainstream 50-pint compressor units, the tier most basements and bedrooms need. Examples: Midea Cube around $260, Dreo 50-pint around $300, Frigidaire Gallery FGAC5044W1 around $308.

• Around $330 to $375: built-in pumps or crawlspace designs, such as the Hisense TopLift at around $330 and the 70-pint AlorAir Sentinel HD35P at around $373.

• Whole-home units: Consumer Reports cites HomeAdvisor's range of $100 to $1,100 depending on size, not including professional installation.

Common mistakes

Most problems come from setup and upkeep, not from the choice of model.

• Comparing a pre-2020 pint rating with a current one.

• Running a standard compressor unit in a very cold space. Reviewed says compressor models struggle below about 40°F and suggests desiccant units for cold areas.

• Blocking airflow. ENERGY STAR advises keeping units without top-mounted discharge away from walls and furniture, and keeping doors and windows closed while the unit runs.

• Neglecting the tank, hose and filter. CR recommends cleaning and sanitizing the emptied tank every week or two. Reviewed suggests flushing drain hoses occasionally with a mild bleach solution, keeping the filter clean, and draining and drying the unit before storing it.

• Treating a dehumidifier as a mold fix. The EPA says mold covering more than about 10 square feet, or significant water damage, may call for a professional, and advises seeing a health professional before cleanup if you have health concerns.

• Keeping an old unit without checking for recalls. In 2021 the CPSC announced a fire-hazard recall of about 2 million New Widetech-made dehumidifiers sold from 2009 to 2017 under brands including Amana, Danby, De'Longhi, Haier, Honeywell, Whirlpool and Whynter. The nameplate on the back of the unit lists the brand, model and pint capacity you need to check.

Sources

• ENERGY STAR: Dehumidifiers
• EPA: A Brief Guide to Mold, Moisture and Your Home
• Consumer Reports: Dehumidifier Buying Guide
• Reviewed: The Best Dehumidifiers
• HouseFresh: Small Dehumidifiers
• WSKG/NPR: About 2 million dehumidifiers in the U.S. have been recalled over possible fire hazard