How to Select the Correct Dehumidifier

3 Steps to Selecting the Correct One

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You’ve started to notice musty smells around your house, or maybe spots of mold. It seems like humidity has reached your door and now you need to get rid of it. You know that a good dehumidifier can solve your problem and bring quality back to your life, but there are different sizes and you don’t know which one is best for you. To obtain quality results, it is important that you select the correct one. So, how to make the right selection?

It’s quite easy!

Dehumidifier sizes are measured according to their capacity in pints. This is the amount of water that they can collect within a 24 hour period under AHAM (Association of Home Appliance Manufacturers) rating conditions (60% relative humidity at 80° F).

The correct capacity will depend mostly upon two factors:

  • Area of the room
  • The humidity of the room

To make a decision, follow these steps:

Step 1: Measure the area of your room 

How to measure it:

  1. Measure the width. Width = W (feet)
  2. Measure the length. Length= L (feet)
  3. Now calculate the Room Area. Room Area = A = W x L (square feet)

How to measure the room size

If the width of your room is 30ft and the length is 40ft, the area of your room will be:

A = W x L = 30ft x 40ft = 1,200 square feet

Step 2: Measure the humidity of the room 

There are two ways to measure the humidity of a room:

1. Using a hygrometer which will show you the exact relative humidity inside your room. There are analog hygrometers as well as digital hygrometers.


2. Another way to find out the humidity levels is by identifying your room’s conditions:
  • DAMP: Occasionally damp space with a musty smell.
  • VERY DAMP: Moist space with some smells and damp stains. Always damp and musty.
  • VERY WET: Sometimes has visible condensation.
  • EXTREMELY WET:  Always has visible condensation.

You’re ready to select the correct dehumidifier for you and your family!

Step 3: Identify the capacity

Now that you know the size of the room and the humidity level, you can select the correct dehumidifier to meet your needs. Check out this table to select:

Table 1. Dehumidifier capacity selection, according to space size and humidity

Dehumidifier Size Selection

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Do you have any additional questions? Feel free to contact our customer service team at


Use information at your own risk:  The information presented is intended for educational purposes only and is not intended to be a substitute for professional advice, diagnosis or treatment. Never disregard professional medical or home improvement advice. The information and suggestions should be discussed with a professional.  You are responsible for independently verifying the information if you intend to rely upon or use it in any way. You use all information at your own risk. 



  • TOSOT Direct Family

    Hi Ralph!
    This can be that it’s on defrost mode (if the air is cool), otherwise, it is just trying to get a few degrees below the target humidity setting.

  • Ralph

    I just bought the 70 pint dehumidifier for my basement. Seems to be working great. Question, does the fan continuously run? The fan on my unit has not shut off even when it has reached the desired humidity level. Thx Ralph

  • Cj

    Can I just use one dehumidifier for the entire apartment?

  • TOSOT Direct Family

    Hi Sylvia! Our dehumidifiers are made in China under the best quality standards.

  • TOSOT Direct Family

    Hi Sharon!

    The main difference between a dehumidifier and a humidifier is that a dehumidifier removes excess humidity from the air, while a humidifier does the opposite (it adds moisture).

    You can check indoor relative humidity levels in your space with a hygrometer. These can change from one season to another.

    Healthy levels are between 30% and 55%:
    - If they’re below 30% you’ll need a humidifier.
    - If they’re above 55% you’ll need a dehumidifier. By removing excess moisture from the air, dehumidifiers can help you prevent mold from growing.

    You can read at our post “How do Dehumidifiers Work” here:

    Does this answer your question?

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