Useful Dehumidifier Settings Chart (An Ultimate Guide)

Dehumidifier Settings Chart

If you live in a humid climate, you know the feeling of dampness in the air. That clammy feeling can also be present in your home, making it feel stuffy and uncomfortable. Not only does humidity make it feel hotter than it is, but it can also cause damage to your garage and cars.

The solution to this problem is a dehumidifier. Dehumidifiers remove moisture from the air, which helps reduce humidity levels and prevents mold and mildew from growing.

But what’s the best way to use a dehumidifier? What’s the best setting to use in different weather and temperature conditions? We’ve got the answers to all of your dehumidifier questions.

And we will also help you understand the settings on your dehumidifier so you can customize them as needed. Let’s begin with how to set up your dehumidifier after getting it first and explore the different options in detail afterward.

Steps to Set Up a New Dehumidfier

So you’ve just purchased your dehumidifier and wish to get started on the right foot? Let’s help you out. Following the proper instructions to set up and use your dehumidifier is essential.

The first thing to do is to read the instructions manual. It gives you a thorough understanding of the product usage guidelines provided by the device manufacturer itself.

Now let’s take a look at some steps you can follow.

  1. Before using your dehumidifier for the first time, wash the filter with warm, soapy water. Rinse the filter thoroughly and allow it to dry completely.
  2. Place the dehumidifier in the room you wish to use it.
  3. Plug the dehumidifier into the AC outlet.
  4. Press the power button to turn on the unit.
  5. Adjust the humidity level using the control knob. Set the knob to the desired level of humidity.
  6. Adjust the fan speed using the control knob. Set the knob to the desired fan speed.
  7. Depending on your humidity level, monitor if the humidity continues to decrease. 
  8. Do not forget to observe the tank and clean it when needed.

Following these steps will get the job done and help you get started. However, it is still necessary to understand what settings would work best for you. The ideal settings depend on various factors, such as temperature and relative humidity levels. Let’s take a look at what the subject matter experts recommend.

HVAC Engineer’s Guide to Dehumidifier Settings

#1 The best setting for you is going to vary based on where you live and what the time of the year it is. Energy Star recommends your humidity settings be set somewhere between 30 to 50 percent. It would work for both the garage and your basement.

#2 Most HVAC engineers recommend 40% as your basement’s most appreciated humidity setting. You shouldn’t go below that level during summertime, especially if you live in a cold area.

#3 Generally, lower humidity settings are safer with no chance of mold, but lower settings require more power. Finding a setting that doesn’t lead to too much or too little humidity is crucial.

#4 You should constantly monitor the humidity levels to find the best setting for your space. Let’s explore how you can control the settings in detail.

What Do The Numbers On a Dehumidifier Mean?

Your dehumidifier RH setting has a range of 35%-85% on it.

The relative humidity is the amount of water vapor in the air compared to the amount the air can hold. As the temperature increases, the air’s moisture can also increase. At lower temperatures, the air is dryer due to the lower capacity to retain moisture.

So if you need drier air, you would press the down button to decrease the RH percentage. Relatively, you would press the up button for damper air to increase the RH value. 

Please ensure you are on normal mode before toggling the percentage, as you cannot change it on other operating modes.

Let’s take a look at a settings chart to understand this further.

Dehumidifier Settings Chart

It is essential to consider the outdoor temperature while choosing the best setting for a dehumidifier. The humidity levels in the air change with temperature and weather conditions.

Here are the recommended humidity settings depending on the outdoor temperature.

Dehumidifier Settings Chart
Outdoor Temperature Indoor Humidity 
-20°F Or Below15-25%
-20°F To 0°F20-35%
0°F to 25°F30-40%
25°F To 50°F40% or Below
50°F And Higher (Most Common)50% or Below

You can use the table above to adjust the dehumidifier RH setting based on the temperature of your area. You can then monitor the levels to figure out what will work best.

Guideline of Which Dehumidifier Settings Will Feel The Most Comfortable

The dehumidifier settings that will feel the most comfortable will depend on the relative humidity in the space, the outdoor temperature, and the amount of ventilation.

If the temperature is warm and the amount of ventilation is low, you should set the dehumidifier to a high setting. And if the temperature is cold and the amount of ventilation is high, you should set the dehumidifier to a low setting.

You can also refer to the following table to set the humidity level according to the temperature.

Comfortable Setting of Dehumidifier
Temperature Humidity Level
5°C to 20°C60%
20°C to 27°C55%

Dehumidifier Settings To Safely Store Items

At this point, you must know how specific dehumidifier settings are required to have optimum performance. It doesn’t just have to do with outdoor temperature or ventilation but also the size of the space you are dehumidifying. Click the link to know more about Dehumidifier Size Chart: What size dehumidifier do you need?

It can be challenging to figure out what settings you need without a chart or guide that tells you. Fortunately, this chart will get you started on the right foot.

Dehumidifier Settings To Store Items
50%Tea, pictures, money, stamps.
50%-44%Camera, lenses, guitar, violin, leather products.
<40%You should maintain only Industrial models below 40%RH.
40%-35%Metals (except iron), circuit board, semiconductors, IC card, tungsten wire, batteries.
35%-25%Precise measures, optical apparatus, electronic detectors, lenses, and medical equipment.
25%-15%Unique chemical materials, medical apparatus, medical samples, seeds, and pollen.

The desired setting is 44% for lenses and camera body/electronics. For guitars and violins, you should set the dehumidifier at 45%.

You should maintain leather products like handbags within the 45-50% range. Be cautious as drier air can cause cracking in the leather. It is recommended to monitor your leather products regularly and apply moisturizer to maintain the best results.

Dehumidifier Setting for Summer

Regardless of the season, when relative humidity is above 60%, it gets necessary to run a dehumidifier. When relative humidity reaches the point where the air is saturated, water vapor begins to condense. When enough water vapor condenses, it creates a cloud of water droplets, which can lead to mold growth if the air is not constantly circulated.

If you’re using a dehumidifier in your home during summer, you’ll want to adjust the settings to accommodate the warmer, more humid air.

The ideal setting for a dehumidifier in the summer is between 50% and 60% relative humidity. It will help remove the excess moisture from the air without making it too dry.

During the summer months, you usually won’t have any problems running your dehumidifier because there is more moisture in the air.

Dehumidifier Settings for Winter

During the winter, you have to consider two things about how to use a dehumidifier to dry a room. First, your device attracts moisture, and if the water in the water tank freezes, it can damage the device.. And second, you may experience freezing winters and may want to consider dehumidifiers that rely on silica or charcoal desiccants.

During the heating season, is colder climate, the humidity levels should range from 30% to 40% RH. This will prevent window condensation. Higher humidity levels can cause water vapor in the air to condense outside the window and reduce visibility.

When purchasing a dehumidifier, you want to pay attention to the temperature of the space that needs to be dehumidified. If the space’s temperature typically falls below 65F, ensure your dehumidifier is specified for lower temperatures.

If the space’s temperature typically falls below 65 degrees Fahrenheit, make sure your dehumidifier is specified to be used for these conditions. This list must have what you need: Best Dehumidifier for Cold Weather

Dehumidifier Setting to Prevent Mold

If you live in a hot area with a damp environment, mold and mildew might be one of the most significant issues you face. Mold is a fungus that thrives in moist environments, and exposure to mold spores can cause various health problems, including respiratory issues, headaches, and skin irritation.

When the humidity in your home is above 50%, it creates the perfect environment for mold to grow. Dust mites also reproduce and thrive in these conditions. They prefer temperatures above 70°F and humidity at around 75 to 80 percent.

By setting your dehumidifier to 50%, you can create an inhospitable environment for mold and dust mites, preventing them from taking hold in your home.

Aprilaire Dehumidifier Setting Chart

A setting chart can be helpful when trying to determine the right setting for your particular needs. Let’s take a look at the recommended setting chart by AprilAire.

It has a range of humidity levels, from low to high, and corresponding dehumidifier settings. By finding the current humidity level of your home on the chart, you can select the corresponding setting on your dehumidifier. It is important to note, however, that the chart is only a guide and that you may need to adjust the setting up or down depending on the specific conditions in your home.

Outdoor Temperature Vs. Indoor Relative Humidity Recommendation

Aprilaire Dehumidifier Setting Chart
Outside TemperatureRecommended RH
+40 Fahrenheit45%
+30 Fahrenheit40%
+20 Fahrenheit35%
+10 Fahrenheit30%
0 Fahrenheit25%
-10 Fahrenheit20%
-20 Fahrenheit15%

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Frequently Asked Questions

Should I run my dehumidifier on low, medium, or high?

Your dehumidifier has three primary settings: low, medium, and high. Each set has its advantages and disadvantages:

Running on a low setting

It is best to run your dehumidifier on low if the overall humidity in your place is also down. Doing this will save money on energy bills, and your dehumidifier will last longer.

Running on a high setting

A higher setting is suitable for environments with high humidity and mold issues. It’s primarily applicable in warmer areas in the summertime. The high setting helps to bring down the humidity quicker. However, it can also decrease the overall life span of the dehumidifier.

Running at a medium setting

Most of the time, a medium setting can be just right, considering the drawbacks of low and high settings. It will efficiently reduce the humidity levels below 50%, resulting in fewer condensation and moisture problems and consuming a reasonable amount of electricity. 

Here is the conclusion to sum it all up. If you’re satisfied with how fast the medium setting works, you should leave it on medium. But humidity levels are still above 50% even on medium; you should switch to high. Likewise, if you can reduce humidity levels below 50% fast, a low setting will do the job.

Why does the humidity never drop below 50%, which is my dehumidifier setting?

The size of the unit is also one of the more essential factors. What size you need ultimately depends on the size of the space that needs dehumidification and the humidity levels. Click here to know Dehumidifier size calculator: Sample Methods to Calculate Dehumidifier Size and Capacity

If the dehumidifier you use fails to bring the humidity levels to the desired setting below 50%, it could be because your dehumidifier is undersized. It doesn’t have enough capacity to store all the moisture.

What should I set my dehumidifier on in the crawl space?

Maintaining healthy humidity levels in your crawl space is essential because moisture can build up in the crawl space due to ductwork condensation, high humidity levels in the air, and ground moisture evaporation.

If you’re noticing musty odors from your crawl space, or rotten wood with sticky surfaces, it might be a sign that mold is growing. It can harm your house’s overall Indoor Air Quality (IAQ).

In the summertime, when the humidity levels are usually higher due to high condensation in the air, you would need to set your dehumidifier to 45-50%. However, with the cold weather, humidity may drop, and placing your dehumidifier to 30-40% will do the job.

Bottom line

The best setting for the dehumidifier depends on the relative humidity of the space and the temperature outside. Experts usually recommend 40% RH, which balances performance and energy consumption.

However, you can use charts as a reference for a starting point and then monitor the levels to make necessary adjustments.

The humidity levels are usually higher in summer compared to winter. So running a dehumidifier in summer is more effortless. However, it would need more maintenance and caution during cold seasons. 

One of the main objectives of dehumidifiers is to prevent mold from growing. You must also check the items usually stored in your dehumidifying room. The humidity levels need to be adjusted depending on which items will be held in the room. 

In conclusion, you would need to check for the size of the unit, temperature outside, ventilation levels, items in the space, and relative humidity levels to figure out the best setting for your area.

Javaria Yousuf

Hey! I am Javaria Yousuf, born and raised in Karachi, Pakistan. It will sound super cliche, but I love reading books like any typical writer. I am also interested in language learning and currently speak 4 languages fluently. Growing up, I always knew that I loved writing. And once I found out about content writing, my mind blew up. A few years ago, I started helping people with their blogs, which is how I became a part of the fantastic team at CarDehumidfier. Writing about dehumidifiers seems like a tedious job. But as someone who lives on the coast and suffers from high humidity 24/7, dehumidifiers and I am a match made in heaven. And I hope to keep finding the best dehumidifiers for your next purchase.

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