Best Dehumidifiers for Basements and Damp Homes (2026)

A basement that smells musty is telling you the air is damp enough for mold. The EPA's guidance is to keep indoor relative humidity below 60 percent, ideally between 30 and 50 percent, and to use air conditioners or dehumidifiers when needed. Below grade, a dehumidifier is usually how you get there, and whether it works or just runs all day comes down to picking the right size and giving the water somewhere to go.

This guide explains what pint ratings mean (the test changed in 2019, which is why older listings and reviews quote bigger numbers), how ENERGY STAR sizes a unit to your space, when a built-in pump is worth it, and two ENERGY STAR certified picks from Frigidaire and Midea, plus the certified 50-pint models to look for in a large or wet basement. Start with a hygrometer, the small, inexpensive humidity meter the EPA describes, so you size to a measured number rather than a guess. If your problem is the opposite, dry winter air upstairs, see our humidifier guide.

At a Glance

How Pint Ratings Work Now

A dehumidifier's capacity is the pints of water it removes in 24 hours under the Department of Energy's test. In June 2019 DOE moved the test for portable units from 80°F to 65°F, which ENERGY STAR says better reflects performance in a basement. The test room is held at 60 percent relative humidity; only the temperature dropped. Cooler air holds less water, so the same machine now earns a smaller number. ENERGY STAR's rough conversion from old ratings to new ones:

• An old 30-pint rating is about 20 pints now.
• An old 40 is about 25, and an old 50 is about 30.
• An old 55 is about 30 to 35, and an old 60 is about 35.
• An old 70 is about 40 to 45.

The change varies by model, so treat those as ballpark figures. When you compare, make sure both numbers come from the current 65°F test. Some listings still quote an 80°F rating, or a "max" figure at 95°F and 90 percent humidity, and neither is the DOE rating. ENERGY STAR's product finder lists every certified model's capacity under the current test, and the capacities in this guide come from it.

What Actually Matters

Size by the space and how damp it is

ENERGY STAR sizes a portable dehumidifier by two things: the floor area and how damp the space is without one. Its minimum capacities, in pints per day under the current test:

• Slightly to moderately damp (feels damp, with a musty smell that may come and go; 50 to 75 percent humidity): 20 to 30 pints under 2,000 square feet, 30 or more above 2,000.
• Very damp (always feels and smells damp, with damp spots on walls and floors; 75 to 90 percent): 25 to 40 pints under 2,000 square feet, 40 or more above.
• Wet (walls or floor sweat, water seeps in, or laundry dries in the space; 90 to 100 percent): 30 to 50 pints under 2,000 square feet, 50 or more above.

ENERGY STAR's own rule is that it's better to oversize than undersize, so if you're between two rows, buy for the damper one. If you're replacing an old dehumidifier, ENERGY STAR says how much water you empty each day is a good guide too.

Drainage: bucket, hose, or pump

Every unit collects water in a bucket and shuts off when it's full. A continuous-drain connection lets a hose carry the water to a floor drain or sump instead, but only by gravity: the manuals say the hose has to run lower than the unit's drain outlet, with no kinks or rises along the way. A built-in pump pushes water up through its hose to a utility sink or out a basement window. Frigidaire's pump model is rated for a hose run and rise of up to 16.4 feet, so the sink or window has to be within that reach. A pump is worth paying for only when there's no drain lower than the unit nearby.

If you need 50 pints or a pump

On ENERGY STAR's chart, a basement over 2,000 square feet needs 40 pints or more if it's very damp and 50 or more if it's wet, and a wet basement under 2,000 square feet runs 30 to 50. With ENERGY STAR's advice to oversize rather than undersize, those are 50-pint jobs. Frigidaire's current 50-pint models were certified in August 2025, and the older W1 versions aren't on ENERGY STAR's current list, so check that the model number ends in Y1:

• FHDD5034Y1: 49.71 pints a day, a 2.7-gallon bucket, three fan speeds, and Wi-Fi. This is the one to choose if you'll empty the bucket by hand, because it holds the most water between trips. It's also the tallest, at 24.7 inches.
• FHDD5033Y1: 49.95 pints a day, a 1.9-gallon bucket, two fan speeds, and Wi-Fi, in a 19.1-inch-tall cabinet. It's a good fit if a hose will do the draining.
• FHDP5033Y1: the same 49.95-pint rating and 1.9-gallon bucket, plus a built-in pump, Wi-Fi, and casters. This is the one for a basement with no floor drain.

Search for the exact model number, and confirm it in ENERGY STAR's product finder before you buy.

ENERGY STAR and running cost

A dehumidifier is a small refrigeration machine that can run for hours a day, so efficiency adds up. ENERGY STAR says a certified model removes the same amount of moisture as a similarly sized conventional unit with about 20 percent less energy. Certification changes as makers update models, so check the exact model number in ENERGY STAR's product finder. The finder also lists each model's estimated annual energy use under DOE's test assumptions, which is the fairest way to compare running costs; the figures for the models in this guide are in the FAQ below.

Cold basements

ENERGY STAR notes that frost can form on the coils when the air drops below about 65°F, which can make the compressor cycle on and off without removing much water. If the space is often cooler than that, look for a unit specified for lower temperatures. Both makers here state a 41°F minimum. Frigidaire's manuals rate its units for 41°F to 89°F and describe an automatic defrost that stops the compressor and runs the fan until the frost clears. Midea's manual says to place its unit where the temperature won't fall below 41°F.

Placement, electrical safety, and upkeep

Clearance comes from your manual. Frigidaire's manual for the 35-pint pick asks for at least 12 inches on every side and 24 inches clear above. Midea asks for about 8 inches (20 cm) on every side and about 16 inches (40 cm) at the air outlet. ENERGY STAR notes that units that blow air out the top can generally sit against a wall, but the manual for your model is the rule to follow. Close the doors and windows to the space while it runs.

Plug the unit straight into a properly grounded outlet. Both makers say not to use an extension cord or share the outlet with other appliances, and ENERGY STAR says to keep drain hoses away from electrical cords and connections. Clean the air filter every two weeks, as both makers' manuals direct. Set the humidity target at 50 percent or a little below, then check your hygrometer to confirm the space stays under 60. Pair the unit with a leak sensor beside the sump pit or water heater, since a dehumidifier can hide a slow leak by drying up the evidence.

Picks Worth Buying

1. Best for most basements — 35 pints with Wi-Fi

On ENERGY STAR's chart, 35 pints covers a slightly to moderately damp or very damp basement under 2,000 square feet, and a larger one that is only slightly to moderately damp. Frigidaire's spec sheet and manual list three fan speeds, humidity settings from 35 to 85 percent in 5 percent steps, a digital humidity readout, a filter-check light, auto shutoff when the bucket fills, auto restart after a power outage, a 24-hour timer, and Wi-Fi for Frigidaire's app. The manual rates it for 41°F to 89°F with automatic defrost, and the drain connection takes a garden hose (you supply it) running down to a floor drain or sump. ENERGY STAR lists it at 379 kWh a year under the DOE test. It blows air out the side, not the top, so give it the 12 inches around and 24 inches above that the manual asks for.

2. Best for one room — the compact 22-pint

One musty bedroom or a bathroom with no fan doesn't need a basement-size unit. Midea rates this one for spaces up to 1,500 square feet. Its product page and manual list two fan speeds, four modes, a 24-hour timer, a 35 to 85 percent setpoint in 5 percent steps, auto restart after a power outage, automatic defrost, and a side-access bucket with a splash guard. The continuous-drain outlet takes a hose you buy separately, and the hose has to run lower than the outlet. Midea says to keep the unit where the temperature stays at 41°F or above, with about 8 inches of space on each side and 16 inches at the air outlet, and to clean the filter every two weeks. ENERGY STAR lists it at 276 kWh a year, and the warranty is one year.

How We Chose

We compare the category first — what a first-time homeowner actually needs from a dehumidifier — then weigh manufacturer specifications, verified buyer feedback, and how the product type is used in real homes. We don't accept free products or payment for placement, and every pick names its compromise. How we research and review.

Crawl space instead of a basement? See what it means when an inspector flags a missing crawl space vapor barrier.

Basement smells and stains. See sewer smell in the house and a water stain on the ceiling.

Frequently Asked Questions

What humidity should I set a basement dehumidifier to?

The EPA says to keep indoor humidity below 60 percent, ideally between 30 and 50. A setting around 50 percent keeps a basement in that range without running the unit longer than it needs to. Check a separate hygrometer now and then to confirm the reading. In colder climates during the heating season, ENERGY STAR suggests 30 to 40 percent indoors to prevent window condensation.

Why does my dehumidifier run all day and the basement is still damp?

Usually one of five things: it's undersized for the space (check ENERGY STAR's chart above), doors or windows are open so it's drying the outdoors, the filter is clogged, the coils are frosting in a basement below about 65°F, or water is getting in. A dehumidifier manages humidity; it can't outrun a leak. ENERGY STAR's first fixes are outside: extend downspouts away from the foundation, keep gutters clear, and make sure the soil slopes away from the house. The EPA adds that anything that gets wet should be dried within 24 to 48 hours to prevent mold. The spring checklist covers gutters and grading.

Can I run a dehumidifier in a cold basement?

Down to the maker's rated minimum, yes. Both picks here are rated down to 41°F, and their automatic defrost handles the frost that ENERGY STAR says can form on the coils below about 65°F. Below 41°F, Frigidaire's manual says the unit won't work properly or its performance will fall greatly, so don't count on a compressor dehumidifier in a space that gets that cold.

How much electricity does a dehumidifier use?

ENERGY STAR's product finder lists an estimated annual figure for each certified model under DOE's test assumptions: 276 kWh a year for the Midea 22-pint, 379 kWh for the Frigidaire 35-pint, and about 520 kWh for Frigidaire's 50-pint models. While running, Frigidaire rates the 35-pint at 360 watts and its 50-pint units at 470 watts. Your real use depends on how damp the space is and how many hours the unit runs; multiply the kWh by the rate on your electric bill for a rough yearly figure.

Do I need a dehumidifier with a built-in pump?

Only if there's no floor drain or sump lower than where the unit sits. A gravity hose is simpler and leaves no pump to maintain. If you do need one, Frigidaire's FHDP5033Y1 is rated for a hose run and rise of up to 16.4 feet, enough to reach a nearby utility sink or basement window, and its manual says to clean the pump filter every two weeks along with the bucket. If you have a sump pit, see our sump pump guide too.

The Bottom Line

For most basements: the Frigidaire 35-pint (FHDD3534Y1) with a hose to the floor drain. For one damp room, the Midea 22-pint (MAD22S1AWWT). For a basement over 2,000 square feet that stays very damp, or any basement that's wet, step up to a certified Frigidaire 50-pint: the FHDD5034Y1 for its bigger bucket, or the FHDP5033Y1 if there's no drain and you need the pump. Whichever you choose, measure with a hygrometer, keep the space under 60 percent (ideally 30 to 50), clean the filter every two weeks, and fix any water that's actually getting in — the dehumidifier treats the air, not the leak.

Sources

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