Too much moisture in your home can lead to mold, mildew, and structural damage. Choosing the right size dehumidifier is critical—too small and it won't keep up; too large and you're wasting energy and money. Use our calculator below to determine the exact capacity you need based on your space and humidity levels.
*Based on 2020 DOE Standards. Look for this "Pints Per Day" rating on the packaging.
How to Choose the Right Size Dehumidifier
When shopping for a dehumidifier, you'll see a rating in "pints." This refers to how many pints of water the unit can extract from the air in a 24-hour period. It does not refer to the size of the internal water tank.
Understanding the 2020 DOE Standards
In 2020, the Department of Energy (DOE) changed how dehumidifiers are tested. They now test at 65°F instead of 80°F. Because cooler air holds less moisture, a unit that was previously rated at 70 pints might now be labeled as a 50-pint unit, even though it is the exact same machine. Our calculator uses the modern DOE standard to ensure you get the right power for your basement, crawlspace, or living room.
Evaluating Your Dampness Levels
- Damp: The space feels humid and has a musty odor only when it is humid outside. No visible moisture on walls.
- Very Damp: The space always smells musty and feels "sticky." You might see damp spots on the floor or walls.
- Wet: You can see water beads or "sweat" on the walls and floor. Seepage is likely present.
- Extremely Wet: Standing water is present. This is common in areas prone to flooding or significant foundation leaks.
Additional Sizing Factors
While square footage and dampness are the primary drivers, consider these secondary factors:
- Ceiling Height: If your ceilings are higher than 8 feet, you should increase your capacity by 10-20%.
- Climate: If you live in an exceptionally humid climate (like the Gulf Coast), size up.
- Occupants: If the dehumidifier is for a room where many people spend time, add 5 pints to your requirement.
- Laundry/Cooking: If the unit is near a laundry room or kitchen, the extra moisture from appliances means you need more capacity.
Common Dehumidifier Sizes
Usually, residential dehumidifiers come in three main categories:
- 20-22 Pints: Ideal for small rooms, bedrooms, or small basements that are only slightly damp.
- 30-35 Pints: The "sweet spot" for medium-sized basements or large living areas with moderate dampness.
- 50 Pints: The heavy-duty choice for large, wet basements or open-plan areas. These are the most common for whole-house moisture control.