How To Buy A Dehumidifier – Part One

If you have areas of your home that have really moist air, then you may have thought about purchasing a dehumidifier. You thought it would be pretty easy just to go online and buy one. Yet when you started searching through dehumidifier reviews your mind was boggled by all of the different sizes, styles and features. Well, that is why I am here today. I am going to help you cut through all of the noise and find the perfect dehumidifier for your home. Just by following these few easy steps, you will not only save time and money but you will also save yourself quite a lot of frustration.

Gauge Humidity Level

You know that your home is humid, but you don’t know exactly how humid it is. That is why you probably need to purchase a hygrometer before you run out and buy your dehumidifier. A hygrometer allows you to take accurate humidity readings of your home so you know exactly what type of humidifier to buy. It is a device that can easily be found at any home improvement store or online. While you don’t necessary have to buy one if you don’t want to, it does make it easier for you to purchase the best dehumidifier possible for your home.

If you don’t want to purchase a hygrometer, then you can do a simple assessment of your home to determine humidity level. While it won’t be as accurate of an assessment as using a hygrometer, it will give you a baseline. Here are some ways to access your room’s humidity level:

  1. 90-100 percent humidity: Standing puddles of water in the room and/or the room is extremely wet.
  2. 80-90 percent humidity: Room smells and feels wet; it also has visible water or mildew stains.
  3. 70-80 percent humidity: No water stains but the room has a clear mold or mildew smell to it.
  4. 60-70 percent humidity: If the room smells slightly damp.

Determine Air Changes Per Hour

Now that you know your room’s humidity level, you can now gauge the ACH (air changes per hour) rate you need to properly dehumidify the room. You can judge your ideal ACH by checking your humidity on the following table:

  1. 90-100 percent humidity: ACH 6
  2. 80-90 percent humidity: ACH 5
  3. 70-80 percent humidity: ACH 4
  4. 60-70 percent humidity ACH 3

Calculate Your Room’s Square Footage

Now you need to figure out the square footage of your room. Using a tape measure, measure the width and length of your room and multiple the two to get your square footage. For example, if you have a 10  by 8 feet, then your square footage would be 80 feet.

Now that you’ve determined your humidity level, your ACH and have calculated your square footage, it is now time to determine your CFM, and how many pints of moisture you need extracted from your room daily. Please read Part Two of our dehumidifier buying guide to continue.


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