70 Pint vs 100 Pint Dehumidifiers: Which Capacity Do You Need?

What the 70-pint and 100-pint ratings mean

Dehumidifier capacity is the amount of water a unit removes in 24 hours at standard test conditions, reported in pints per day. The U.S. Department of Energy defines the test procedure, and the capacity identifies the relative amount of moisture the unit can remove. A 70-pint model is rated to remove 70 pints per day at those conditions; a 100-pint model is rated to remove 100 pints per day.

The test conditions changed in 2020. Portable dehumidifiers are now tested at 65°F rather than 80°F, which is closer to a basement setting. Because cooler air holds less moisture, the same unit can report a smaller capacity under the new test. ENERGY STAR's rough correlation table shows that an old 70-pint portable may be rated 40 to 45 pints today, while an old 100-pint portable may be rated about 85 pints. Whole-home models changed too; for example, an old 80-pint whole-home unit may now be labeled 70 pints.

Always confirm which rating is printed on the specification sheet. If you are replacing an older dehumidifier, the smaller new capacity may still meet the same need. See pint rating explained and matching square footage to pints for more.

The table below summarizes the main differences.

Coverage area and moisture conditions

ENERGY STAR says the capacity you need depends on two factors: the size of the space and the conditions that exist without dehumidification. Its chart lists minimum recommendations. For a large room over 2,000 sq ft, it suggests at least 30 pints per day for a slightly to moderately damp space, at least 40 pints for a very damp space, and at least 50 pints for a wet space. A 70-pint unit exceeds all of those minimums, and a 100-pint unit adds more margin.

For rooms under 2,000 sq ft, ENERGY STAR's chart ranges from about 20 to 50 pints depending on dampness, so a 70-pint unit is generous for most single rooms. A 100-pint unit makes sense for very large open areas, finished basements, crawl spaces, or spaces with high moisture loads such as drying laundry. EPA recommends drying water-damaged areas within 24 to 48 hours, and CDC recommends keeping indoor humidity no higher than 50%, so keeping up with moisture quickly is the goal.

An undersized unit can run almost continuously and still fall short. ENERGY STAR advises that it is better to oversize than undersize. Work through sizing a dehumidifier by square footage before settling on a number.

Energy use and efficiency

A 100-pint unit removes more water and generally draws more total energy, but the efficiency rating matters more than the capacity alone. Efficiency is measured by the integrated energy factor, the liters of water removed per kilowatt-hour of energy consumed. A higher IEF means more water removed for each kilowatt-hour. See integrated energy factor explained.

ENERGY STAR certified dehumidifiers use about 20% less energy than similarly sized conventional units. DOE also assigns different minimum efficiency values by capacity class; in its 2025 proposed rulemaking, it lists 1.70 liters per kWh for units rated 54.01 to 75.00 pints per day and 2.5 liters per kWh for units rated above 75.00 pints per day. That means a 100-pint unit is held to a higher efficiency minimum for its size.

If energy use is a priority, compare the IEF value on each specification sheet, look for ENERGY STAR certified models, and check dehumidifier electricity usage.

Suitability: basements, large rooms, and whole-home use

Both 70-pint and 100-pint units can handle a damp basement, and UMN Extension recommends using a dehumidifier if your basement is damp. Basements are often cooler, though. ENERGY STAR notes that frost can form on condensing coils when air temperature drops below 65°F, which can make the compressor cycle on and off without removing moisture. If your unit will sit in a cool basement, check for low-temperature performance or an anti-frost sensor; read low-temperature performance for guidance.

A portable 70-pint unit is easier to move from room to room and is usually enough for one large floor or finished space. A 100-pint unit is the stronger pick for larger open floor plans, crawl spaces, or rooms that stay very damp for long periods. For ducted whole-home installation, 100-pint models and larger are more common because they are sized for multiple rooms at once; compare portable vs whole-house dehumidifiers.

Also think about drainage. A continuous drain hose or built-in pump can save you from emptying a bucket in a large basement. The best basement dehumidifiers guide covers both capacities.

Which capacity should you pick?

Start with the room and the moisture level. If the space is moderately damp and under 2,000 sq ft, a 70-pint unit is likely enough. If the space is very damp, larger than 2,000 sq ft, or has high moisture loads, a 100-pint unit gives you more margin. ENERGY STAR states plainly that it is better to oversize than undersize.

After you choose capacity, match the unit to your situation. A 70-pint is the practical choice for a bedroom, office, main floor, or small basement. A 100-pint is better for a large basement, crawl space, open floor plan, or light commercial area. Then decide on features such as continuous drain, pump, filter, and controls. Browse the best 50 to 99 pint dehumidifiers or best 100 to 149 pint dehumidifiers guides for model-level comparisons.

Signs that point to each size:

• Stay at 70 pints: moderately damp rooms, rooms under 2,000 sq ft, single-floor use, or spaces where you can move the unit between areas.
• Step up to 100 pints: very damp or wet basements, spaces over 2,000 sq ft, crawl spaces, commercial areas, or whole-home ducted systems.

What to pick for your use

Questions

Is a 100-pint dehumidifier always better than a 70-pint?

No. The right capacity depends on room size and moisture conditions. ENERGY STAR says to choose based on those factors and that it is better to oversize than undersize, but a much larger unit also draws more energy and can cycle off quickly in a small space. A 70-pint is usually enough for a moderately damp room.

Does a 100-pint unit use twice the energy of a 70-pint?

Not automatically. Efficiency is measured by integrated energy factor in liters per kilowatt-hour. DOE sets different minimum efficiency values by capacity class, and ENERGY STAR certified models use about 20% less energy than conventional units. Compare the IEF on the specification sheet rather than guessing by capacity.

Can I put a 100-pint dehumidifier in a small bedroom?

You can, but it may be more than the room needs. ENERGY STAR's chart suggests lower capacities for rooms under 2,000 sq ft, so a 70-pint is usually a better fit for a bedroom. If you already have a 100-pint unit, a built-in humidistat will help prevent over-drying by stopping at your target humidity.

How do I know whether a 70-pint rating is the current rating or an older rating?

DOE changed the test procedure in 2020, so newer portable ratings are measured at 65°F instead of 80°F and can look smaller than old ratings. ENERGY STAR's table gives rough correlations: an old 70-pint portable may be rated 40 to 45 pints today, and an old 100-pint portable may be rated about 85 pints. If you are replacing an older unit, a smaller new number may still match your needs.

Should I choose 70-pint or 100-pint for a damp basement?

It depends on basement size and dampness. ENERGY STAR recommends larger capacities for wet spaces, so a 100-pint gives more margin in a large damp basement. Because basements are often below 65°F, also check for low-temperature performance or an anti-frost sensor so frost on the coils does not stop moisture removal.

What matters more, pints or features like a pump and continuous drain?

Capacity should come first, because an undersized unit cannot keep up. After that, features make the unit practical: a continuous drain reduces emptying, a pump lets water drain upward, and a humidistat controls run time. Match the pint rating to the space, then choose features.