Quick answer
The best 50 pint dehumidifier is one rated at 50 pints under the DOE test, which runs at 65°F, not a unit sold on a 95°F figure; for most damp basements that is the Midea 50 Pint Dehumidifier, rated 4.4 stars across 226 Amazon ratings, with wheels, Wi-Fi and a hose socket. Midea's 50-pint models on ENERGY STAR's list are certified at 49.67 to 49.96 pints a day on that test. If the nearest drain sits above the floor, buy the Midea 50 Pint Dehumidifier with Pump instead. The Frigidaire 50 Pint Dehumidifier with Wi-Fi is the alternative from a second major brand.
Buyer's Guide
What to know before you buy.
What Changed in 2019, and Why '50 Pint' Got Smaller
Dehumidifier pint ratings come from a federal test, and the test changed. ENERGY STAR explains that the DOE procedure in force since June 2019 tests portable dehumidifiers at 65°F rather than 80°F. Cooler air holds less water, so the same machine reports a lower number on the new test, and some brands now sell a machine as '70 pint' on the old test and '50 pint' on the new one. ENERGY STAR's own approximate conversion is less generous than that: it lists an old 70-pint portable at about 40 to 45 pints on the new test and an old 90-pint at about 55. On that table, a true 50-pint unit today sits between an old 70 and an old 90. If you are replacing a unit bought before 2019, compare on those numbers, not on the label alone.
Why an '80 Pint' Listing May Not Be a 50 Pint Machine
Many Amazon listings lead with a figure measured in hot, saturated air, such as 80 pints at 95°F and 90% RH. That is not the DOE figure, and it is usually far higher. ENERGY STAR's certified list, read on 12 Oct 2026, shows the scale of the gap: Waykar's CTH80B is certified at 24.84 pints a day under the DOE test and its CTH150B at 49.43, while Waykar's listings quote their pint figures at 95°F. Among the listings considered for this page, the Waykar and KNKA units sold as 80 pints, and an AEOCKY compact sold as 50 pints, all quote 95°F figures without a DOE rating. They may be good machines, but nothing on their listings shows they are 50-pint units on the current scale, so they are not ranked here. To check any unit, find its model number and look it up on ENERGY STAR's list.
How Big a Space a 50 Pint Unit Handles
ENERGY STAR sizes a dehumidifier by how damp the space is as well as its area. Under 2,000 sq ft, it suggests 20 to 30 pints a day for a room that smells musty at times, 25 to 40 for one that always feels damp with damp spots on walls or floor, and 30 to 50 where walls sweat or water seeps in. Over 2,000 sq ft, the same three conditions call for 30, 40 and 50 pints or more. A 50-pint unit therefore covers a wet basement up to about 2,000 sq ft, or a very damp larger one. ENERGY STAR also says it is better to oversize than undersize. Treat the 4,500 sq ft on the Midea listings as a best-case ceiling, not a recommendation.
Drainage: Tank, Hose or Pump
At 50 pints a day, a tank is not a plan. Fifty pints is 6.25 gallons, and the tanks stated on the listings reviewed for this page hold 0.5 to 1.72 gallons, so a wet basement would fill one several times a day. Use the hose socket and a floor drain if one sits lower than the unit; both Midea listings say the hose is not included, so buy a standard hose with the machine. If the nearest drain is a laundry sink or a window, the pump model pushes the water up, though Midea does not state how high. Keep the hose falling and the pump line free of kinks, and glance at the tank now and then. Water collecting in it means the hose or pump is not keeping up.
Who Does Not Need a 50 Pint Unit
A 50-pint dehumidifier is the wrong buy for several jobs. A single bedroom, bathroom or closet needs a smaller unit, because a 50 that reaches its set point quickly just cycles on and off while taking up floor space. A crawl space or unheated basement below 65°F needs a machine rated for low temperatures: ENERGY STAR notes that frost can form on the coils below 65°F, and none of the three listings here states a low-temperature rating. A home damp on every floor is better served by a whole-home unit on the ductwork. A flooded room needs drying equipment set up to the IICRC S500 water damage restoration standard rather than a household unit, and EPA advises drying water-damaged areas within 24 to 48 hours to prevent mold growth.
Efficiency and Running Hours
A basement dehumidifier can run for thousands of hours a year, so efficiency matters more than a small difference in pints. ENERGY STAR measures it as liters of water removed per kilowatt-hour and says certified units are 20% more efficient than non-certified models. On its current list, Midea's and Frigidaire's 50-pint models mostly sit at 2.01 L/kWh, while Waykar's CTH150B reaches 2.20 L/kWh and meets the Most Efficient criteria. Running hours matter as much as the rating. Set the humidistat at 45% to 50% rather than the lowest setting, since EPA's guidance is below 60% and ideally 30% to 50%, and clean the filter on the schedule in the manual so airflow over the coil stays strong.
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