50-Pint vs 70-Pint Dehumidifiers: Which Capacity Is Enough?

The Bottom Line: Match Capacity to Your Space

Choosing between a 50-pint and a 70-pint dehumidifier comes down to two things: the size of the room and how damp it feels. The U.S. Environmental Protection Agency recommends keeping indoor humidity below 50 percent to prevent mold growth, and a dehumidifier that is too small will struggle to keep up. ENERGY STAR publishes a sizing chart that maps room conditions to recommended capacity in pints per day.

If your space is under 2,000 square feet and is only slightly to moderately damp, a 50-pint unit is usually sufficient. For rooms over 2,000 square feet or spaces that feel very damp or wet, a 70-pint model gives you more headroom. Oversizing is better than undersizing, according to ENERGY STAR, because a larger unit cycles less and removes moisture more reliably. For a fuller explanation of how pint ratings work, see our article on pint ratings.

Coverage Area: How Many Square Feet Can Each Handle?

ENERGY STAR's sizing guide divides rooms into small-to-medium (under 2,000 square feet) and large (over 2,000 square feet). For a small-to-medium room that is very damp (75 to 90 percent relative humidity), it recommends a capacity of 25 to 40 pints per day. A 50-pint unit sits comfortably within that range. For a large room in the same condition, the recommendation jumps to 40 pints or more, so a 70-pint unit provides better margin.

In wet conditions (90 to 100 percent humidity), large rooms need 50 pints or more, making 70 pints the logical pick. If you have a large basement or an open plan area that gets musty, a 70-pint unit is the safer choice. For step-by-step sizing advice, read our guide on sizing a dehumidifier by square footage.

Water Removal: What 50 and 70 Pints Per Day Mean

Capacity is measured in pints of water removed per day under standardized test conditions. The U.S. Department of Energy changed the test procedure in 2019 to a cooler 65°F setting, which better reflects basement conditions. As a result, newer dehumidifiers often show lower pint ratings than older models with the same physical size. The ENERGY STAR conversion table shows how old capacities map to new ones, but the actual change varies by model.

In practical terms, a 70-pint unit removes 20 more pints per day than a 50-pint unit. That difference matters when your room is very humid: the larger unit will reach your target humidity faster and then cycle off, while a smaller unit may run continuously and still not keep up. Our article on dehumidifier water removal testing explains how ratings are derived.

Energy Use: IEF Determines Efficiency

Both 50-pint and 70-pint dehumidifiers can be energy efficient if they carry the ENERGY STAR label. ENERGY STAR certified models use more efficient coils, compressors, and fans, removing the same amount of moisture while using about 20 percent less energy than conventional units. Efficiency is measured by the Integrated Energy Factor (IEF), which expresses liters of water removed per kilowatt-hour of energy consumed.

A larger 70-pint unit will consume more electricity overall because it moves more air and runs a larger compressor. However, if your room needs 70 pints of removal, a 50-pint unit will run longer and may actually use more energy to achieve the same result. Choose a model with a high IEF and look for the ENERGY STAR label. Our guide to Integrated Energy Factor explains how to compare models.

Drain Options: Bucket and Continuous Drain

Most portable dehumidifiers in both sizes come with a removable bucket and an automatic shutoff when full. ENERGY STAR notes that some models include a hose fitting that lets you direct condensate into a floor drain or sump pump, so you never need to empty the bucket. For a 70-pint unit, a continuous drain is especially useful because it removes more water per day.

Some larger units also offer a built-in condensate pump that can push water up to a sink or drain located above the dehumidifier. If your drain point is above floor level, look for a model with a pump or plan to use an external pump. See our comparison of built-in pump vs gravity drain and our guide to continuous drain hose setup for practical tips.

Which Capacity Should You Pick?

Use the ENERGY STAR sizing chart as your starting point. For a bedroom, office, or small basement under 2,000 square feet that feels slightly damp, a 50-pint unit will do the job. For a large basement, open living area, or any space that feels consistently damp or shows water stains, step up to a 70-pint model.

Also consider how often you can empty the bucket. A 70-pint unit in a very humid room can fill a standard bucket in a few hours. If you prefer hands-off operation, choose a model with a continuous drain hose or a built-in pump. Both capacities are available with these features, so your choice should be driven by the space, not the feature list alone. To see current models, browse our picks for 50 to 99 pint dehumidifiers.

What to pick for your use

Questions

Is a 70-pint dehumidifier always better than a 50-pint?

Not always. If your room is under 2,000 square feet and only slightly damp, a 50-pint unit will be sufficient and likely run less often. A 70-pint unit is better for larger spaces or higher humidity levels, but for a small, dry room it may cycle on and off too quickly and use more energy than needed.

How do I know if my room needs 50 or 70 pints?

Measure the square footage and assess how damp the room feels. ENERGY STAR's sizing chart says a slightly damp room under 2,000 square feet needs 20-30 pints per day, so 50 pints covers it. A very damp large room over 2,000 square feet needs 40+ pints, so 70 pints is the safer choice.

Do 70-pint units use much more electricity?

They use more electricity because they have larger compressors and fans, but the efficiency metric (IEF) matters more. An ENERGY STAR certified 70-pint model can be more efficient than a non-certified 50-pint model in terms of liters removed per kWh. If your space actually needs 70 pints of removal, the larger unit will finish faster and may not cost more to run overall.

Can I use a 50-pint dehumidifier in a large basement?

You can, but if the basement is over 2,000 square feet or feels very damp, a 50-pint unit will run almost continuously and may not keep humidity below 50 percent. ENERGY STAR recommends at least 40 pints for a large very damp room, so a 70-pint unit gives you the capacity to actually control the moisture level.

What does the new test rating mean for 50 and 70 pint models?

Since 2020, the Department of Energy's test temperature dropped from 80°F to 65°F, so capacities reported under the new standard are lower than older models with the same physical size. A new 70-pint unit removes about as much water as an older 90-pint model, according to the ENERGY STAR conversion table. Always compare current ratings, not old ones.