50 Pint vs 70 Pint for a Large Room: Which Size Fits?

Pint ratings changed in 2020

Dehumidifier capacity is expressed in pints per 24 hours, but the number on the box today is not the same as it was a few years ago, so you may want to compare current dehumidifier picks for the latest models. The U.S. Department of Energy (DOE) revised the test procedure in 2020 to measure performance at 65°F instead of 80°F, which better reflects a basement setting. The cooler air holds less moisture, so a unit tested under the new method reports a lower capacity than the same unit under the old one. For example, a pre-2020 70-pint dehumidifier is roughly equivalent to a 40 to 45 pint model under the new rating. This matters because a 50-pint unit today is more capable than a 50-pint model from before 2020.

To understand how the rating system works, see our explainer on pint ratings.

Match capacity to room size and dampness

ENERGY STAR provides a simple sizing chart. For a space under 2,000 square feet, which includes a large room up to 1,500 square feet, the recommended capacity depends on the level of moisture. If the space feels slightly to moderately damp, with a musty odor and 50 to 75 percent relative humidity, you need 20 to 30 pints per day. If it feels consistently damp and has damp spots on walls or floors (75 to 90 percent humidity), you need 25 to 40 pints. For a wet space, where walls or floors sweat or seepage is present (90 to 100 percent humidity), the recommendation is 30 to 50 pints. These figures come from ENERGY STAR's buying guidance.

Room size alone is not enough. The actual moisture load from activities, leaks, and outdoor humidity matters. For a detailed method, read our guide on sizing a dehumidifier by square footage.

50-pint vs 70-pint: what the difference means in practice

For a room up to 1,500 square feet, a 50-pint dehumidifier (under the current DOE rating) sits at the top of the recommended range for wet conditions. It will remove up to 50 pints of water per day at test conditions, which is usually enough to handle a heavily damp space. A 70-pint unit goes beyond that, giving you more reserve capacity. ENERGY STAR advises that it is better to oversize than undersize, because a larger unit can finish the job faster and may not need to run as often in very humid conditions. However, an oversized unit also means more energy consumption and a larger footprint, and it may cycle on and off more frequently if the space does not generate that much moisture.

For a typical large living area or finished basement that is moderately damp, a 50-pint model is a solid match. For an unfinished basement with constant seepage, a workshop where you dry laundry, or a space that gets very wet after rain, a 70-pint unit provides the extra headroom you need. If you have a very large open floor plan or high ceilings, lean toward the larger size. See our picks for 50 to 99 pint dehumidifiers and up to 1,500 sq ft models.

Other features that matter for large rooms

Capacity is only part of the decision. A dehumidifier for a large room often runs for long periods, so look for a model with a built-in pump if you cannot rely on gravity drainage. A pump lets you route the water upward to a sink or outside, which is convenient in a basement. See our comparison of built-in pumps vs gravity drains.

Energy efficiency is also important. Since 2019, dehumidifiers are rated by Integrated Energy Factor (IEF), which includes the energy used during cycling. A higher IEF means fewer kilowatt-hours per liter of water removed. Look for the ENERGY STAR label, which indicates the unit uses about 20% less energy than a conventional model. You can explore ENERGY STAR certified dehumidifiers.

• Continuous drain hose connection so you do not have to empty the bucket. See continuous drain hose setup.
• Auto-defrost for spaces that drop below 65°F. Read about auto-defrost.
• A washable filter to reduce maintenance. Check our filter maintenance guide.

How to decide between 50 and 70 pints

Start by measuring the room and noting the dampness level. Use the ENERGY STAR chart as a baseline. For a room under 2,000 square feet, a 50-pint model covers even the wet category (30 to 50 pints). If your space exceeds that or if you want a buffer for especially humid climates or frequent rain, a 70-pint unit gives you more capacity.

Also consider how the unit will be used. A 50-pint model is lighter and easier to move, while a 70-pint unit is heavier and may be better as a stationary setup. If you plan to leave it in one place with a continuous drain, the larger unit may be worth the extra storage space. For a dedicated large basement, a 70-pint model is a common choice. Read our basement dehumidifier guide and the article on dehumidifiers for large basements up to 1,500 sq ft.

What to pick for your use

Questions

Is a 70-pint dehumidifier too big for a 1,500 sq ft room?

Not necessarily. Oversizing is generally recommended by ENERGY STAR, but a 70-pint unit may consume more energy and be heavier. For a room that is consistently wet, it is a good choice. For moderate humidity, a 50-pint will suffice.

What is the difference between old and new pint ratings?

Before 2020, capacities were tested at 80°F; now they are tested at 65°F, so the numbers are lower. A new 50-pint unit is roughly equal to an old 70-pint unit in terms of water removal capacity, according to ENERGY STAR.

Should I choose a 50-pint or 70-pint if I have a basement?

For a typical finished basement under 1,500 sq ft, 50 pints is usually enough. For an unfinished basement with moisture problems, a 70-pint unit provides extra margin. See our basement guide for specific recommendations.

How do I know if my room is damp enough to need 70 pints?

Use the ENERGY STAR criteria: if the space feels wet, with sweating walls or seepage, you are in the wet category, which recommends 30 to 50 pints for rooms under 2,000 sq ft. A 70-pint adds headroom but is not mandatory.