Dehumidifier Buying Guide

Dehumidifier buying guide

If you have high humidity in your home then you should use a dehumidifier. These appliances remove moisture and help keep desired humidity level. Keeping a balanced humidity limits mold growth reduces uncomfortable muggy conditions, and protects your home from damage.

Dehumidifiers are available in a variety of sizes and moisture removal capacities. Many models have a lot of good features that make your life easier. We have made this guide to help you understand how big and advanced model you may need.


Why Should You Use A Dehumidifier

Recommended indoor humidity level is between 30 and 50 percent. If a humidity level is higher than 60 percent than it is considered high and you should reduce it by 30 to 50 percent. And the best way to reduce a humidity level is by using a dehumidifier.

Lowering humidity is not the only reason why you should use a dehumidifier. There are other reasons too.

Preventing Mold and Mildew Growth. The best way to stop a mold or mildew problem before it even happens is to maintain a healthier humidity level all the time. Mold and mildew spores grow and reproduce in warm, wet conditions above 60 percent. The areas that are sensitive to mold infestations are basements, bathrooms, and kitchens. Use a dehumidifier regularly in these areas to help keep them dry and mold-free.

Managing Allergies. High moisture can increase common household allergy triggers like dust mites, mold spores, and airborne bacteria, all of which can grow and reproduce quickly in humid conditions. Keep humidity level between 30 to 50 percent to make your space less hospitable to these allergy triggers and help you better manage your allergy symptoms.

Pest Control. Pests, for example, spiders, cockroaches, silverfish, centipedes loves moist conditions. Keeping a drier space repels these disturbing critters and keeps them out of your home for good.

Supplement Your Air Conditioner. Feeling chilly in your home lacks two things: cool air and dry air. Apply a dehumidifier to increase your primary air conditioner to keep the air dry and save your AC from working overtime to try to reduce your humid space.

Home. Moisture makes damage to your home for example support beams, buckling floorboards, hardwood floors etc. Keep the humidity level below 60 percent to prevent costly repairs.


Ideal Place for a Dehumidifier

Dehumidifiers offer flexibility because of the variety of places in your home where you can place it.

  • Basements – most of them are damp or wet. Place it there to save protect your home’s structure.
  • Bathrooms – everyone has seen how humid is the bathroom when you come out of the shower. If your bathroom has a bad ventilation, it needs a dehumidifier. You don’t want mold in your bathroom.
  • Garages – may be damp too
  • Spa and indoor pool areas – usually have a good ventilation but can consider a dehumidifier as well.
  • Water-damaged rooms
  • Other places according to your own needs

How Dehumidifiers Work

By their operation, dehumidifiers remove water from the conditioned air.

Refrigeration.

This is the most common type. A fan sucks moisture in through a dehumidifier inlet. A humid air passes over freezing cold tubes through which a coolant circulates. As the air cools, the moisture it contains turns back into liquid water and drops down off the tubes. Then the free of moisture air passes over a heating element and warms back up to its original temperature and blows back into the room through the outlet. The moisture that was in the air originally drops down into a bucket at the bottom of the machine and when it is a full dehumidifier automatically turns off and switches on an indicator light telling you the machine needs emptying.


Which Type of Dehumidifier  Do You Need?

Dehumidifiers are available in 2 main types: residential and commercial/industrial models.

Residential dehumidifiers Whynter RPD-311DW Elite D-Series Energy Star Portable Dehumidifier, 30-Pint

For separate spaces like basements or bathroom, the best are residential dehumidifiers. They are portable, available in small, medium, and large moisture removal capacities. Usually, these dehumidifiers have a lot of features such as electronic control panels, multiple fan speeds, casters, onboard humidistats, water buckets, and maybe Energy Star-qualified.

Whole House Dehumidifiers

For whole home needs, you can use a whole home dehumidifier. They are connected to the HVAC system and dehumidify the air as it’s cooled. Dry, cool air is then dispersed everywhere in your home through your ductwork.

You may also choose standalone whole house dehumidifiers. They are portable, easy to set up and operate. It’s critical to place them in a centralized location in the practice space for the most efficient dehumidifying.

Commercial/industrial dehumidifiers

Commercial dehumidifiers bigger and heavier-duty units that are made for more unforgiving dehumidifying jobs. These dehumidifiers have a huge moisture removal capacities and can operate in extreme conditions. These models have features such as low-temperature operation internal condensate pumps, loss of power protection, and simplified controls. You might use an industrial dehumidifier to help remove moisture in a flood-damaged space or to control humidity in an indoor pool area, for example. Some small industrial models are also more effective choices for residential basements and crawl spaces.


Choosing the Perfect Size Dehumidifier

Dehumidifier manufacturers show pints as capacity. The more pints, the better the performance. For example, 40 pints means that the dehumidifier can remove 40 pints of moisture per day. All dehumidifiers have stated how many pints of moisture they can remove. You may have a question how to know if you need for example 30 pints per day or 70 pints? You can convert pints to square feet. But to do that you have to know at least how damp is your space. Is it only a little damp, moderately damp, very damp or extremely wet?

A little damp space has a 50 to 60 percent humidity. It feels damp and has an occasional musty smell.

Moderately damp space often feels damp and often smells musty. Humidity level is between 60 and 70 percent.

The very damp place feels wet, smells musty; damp spots appear on walls and floors. Humidity is between 70 to 85 percent.

Extremely wet space feels wet, smells musty; seepage appears on walls and floors; may have mold growth. Humidity is between 85 and 100 percent.

To help simplify your selection in size, take a look at the sizing chart below:

The condition
of the space

Up to 500
Sq. Ft.

501-1000
Sq. Ft.

1001-1500
Sq. Ft.

1501-2000
Sq. Ft.

2001+ Sq.
Ft.

A little damp

50-60%

20 pints

25 pints

35 pints

45 pints

60+ pints

Moderately damp

60-70%

25 pints

30 pints

40 pints

55 pints

70+ pints

Very damp

70-85%

30 pints

35 pints

50 pints

 65 pints

80+ pints

Extremely wet

85-100%

35 pints

40 pints

60pints

75 pints

90+ pints


Capacity at AHAM vs. Capacity at Saturation

There are two ways of testing conditions how manufacturers may rate the moisture removal capacities of their dehumidifiers. The words AHAM and saturation refer to the circumstances in which dehumidifiers are tested. 

AHAM grades are registered at average conditions, which are recorded to be 60 percent humidity and 80 degrees Fahrenheit. These measurement circumstances are what the Association of Home Appliance Manufacturers suggests. AHAM conditions are supposed to give the most realistic representation of how a dehumidifier will work because the testing circumstances are so close to what most homes and structures will experience.

A saturation rating is recorded at 90 percent humidity and 90 degrees Fahrenheit, which serve much more intense conditions that won’t usually be experienced in the area. Why should test in conditions that rarely will encounter? Because measuring at saturation attends measure nearby to the total maximum volume of moisture a presented unit can obtain in a single day. It’s similar to describing a car’s top speed as a notice of overall achievement.

This makes a dehumidifier choice a bit complicated. Because when you search for a dehumidifier you have to think about the testing conditions each model might have been rated in. A dehumidifier that’s able to remove 90 pints of water in saturation conditions (100% humidity) will only remove around 50 pints of water in AHAM conditions (60% humidity). That is because a dehumidifier extracts less water in the drier air than in more humid conditions. Be sure to keep testing conditions in mind when you’re judging models. If you are searching for a dehumidifier for a very wet space, look for a unit that is tested at AHAM. It will be more robust than a model rated at saturation.


Draining Your Dehumidifier Friedrich D70BP 70 Pint Dehumidifier with built-in drain pump, Front Bucket and Continuous Drain

Dehumidifiers with refrigeration systems collect moisture and have to get rid of it somehow. Most dehumidifiers have buckets as the main draining method but there are also other ways to get rid of it.

  1. As you may already know most of the dehumidifiers comes with a bucket or water reservoir. It’s very simple to empty full bucket but you have to do that very often depending on how humid is your space. Most of the dehumidifiers come with smaller buckets than they can actually collect in a day. So if your area is very humid better avoid this method and keep reading below about other methods.
  2. Gravity Drain. This is the second most often used method to remove collected water. If the dehumidifier has a draining hose port you can attach a hose to it and let the dehumidifier water out automatically. You can use various types of hoses. Keep in mind that most sellers don’t include them. Cons for this method is that you can’t move water upwards. And you need to put the other hose end somewhere.
  3. Internal Condensate Pump. The best method in my opinion. This is what I call: set it and forget it. This method works only if a dehumidifier has this option. With this method, you can add a hose and pump water whenever you want – upwards outside the window, in your sink or whenever you want. A dehumidifier will pump away collected moisture automatically.

External Condensate Pumps

If a dehumidifier is equipped with a gravity drain it can be used with an external condensate pump as well. This is a special accessory that works exactly like an internal condensate pump, pumping moisture out of the water reservoir. To use, you have to attach a hose from the gravity drain port on the dehumidifier to the pump. Then, you have to route another pipe from the pump to your chosen draining location.


Features to Look For Whynter RPD-702WP Energy Star Portable Dehumidifier with Pump, 70-Pint

Almost all dehumidifiers have a lot of features to add comfort to your life and help the unit best fit your needs. Most of the popular features you can see below:

Automatic Humidistat. Best feature out there. A humidistat automatically maintains your desired level of humidity by triggering the dehumidifier to run only when needed. Helps to save energy.

Programmable Timer let you program startup and shutoff times. Great if you don’t have time to turn it on or off.

Various Operating Modes and Speeds – Pick from multiple speeds and modes to find the best level of dehumidification for your needs.

Casters and Handles. Most of the dehumidifiers are quite large and that is why they have casters and handles. Also, almost all of the units which have water containers have them with handles.

Automatic Restart. Dehumidifier automatically restarts on power failure. Great feature.

Low-Temperature Operation. Most residential dehumidifiers operate successfully down to 41 degrees F. Look for this feature if you’re going to use your unit in a cooler crawl space or basement.

Automatic Defrost. In freezing temperatures, automatic defrost helps maintain your unit operational by defrosting any ice accumulation to reduce downtime.

Air Filter. Most household dehumidifiers have a washable air filter that catches allergens and particles and protects the unit’s internal components from damage caused by debris.


Dehumidifier Noise Level

Most of the dehumidifiers, especially those with compressors and fans, work by moving air through them. And this process can be quiet only when moving a low amount of air. As soon as these dehumidifiers start to move a decent amount of air they become noisy. How loud will be this noise depends on the model. Some of them have a quiet operation (at least they presents them as quiet). With these models, manufacturers have taken several steps to reduce noise by isolating the fan or using a smoother-running fan, for example.

Dehumidifier noise level is measured in decibels (dB). Most of the dehumidifiers are loud when working but the good news is that 90% of the time you don’t use them in spaces where you spend most of your time.


Fan Operation

Dehumidifier with a fan has two operation possibilities. One is when a dehumidifier fan runs continuously and one is when the system is actively dehumidifying. Which is the best and more efficient? Read further.

Continuously fan run time. The fan is constantly on whether the compressor is running or not. With this operation, the fan helps move air continuously through the humidity sensor (if equipped) so that the dehumidifier measures a more correct humidity level in the room.

This option helps a dehumidifier set fan speed and maintain your desired humidity level consistently. Air is being dehumidified very effectively. Minus with running fan is that it consumes more energy.

Fan Runtime Only When Dehumidifying. When compressor turns off, also fan turns off. Saves energy because the fan doesn’t run without a need and help secure the system more efficient.

So you still don’t understand which is really more efficient? Due to the fact that dehumidifiers with fans that run only when dehumidifying only save a small amount of energy we would choose a dehumidifier with a continuous running fan. These models will more accurately sense your room’s humidity level and adjust operation accordingly, so you’ll get the best results and you’ll stay within your energy budget.


Dehumidifier Maintenance
DeLonghi DD45PE 45-pint Dehumidifier with Patented Pump

Usually, dehumidifiers are trouble-free, but they do require maintenance. You will have to empty the water tank, clean the unit periodically to keep your home free of extra moisture, dust, and air pollutants such as mold and mildew that can be possibly harmful to your health. That will also help prolong your dehumidifier life and overall performance.

Here are some tips for better maintenance:

  • Place your dehumidifier at least 6 inches (15.24 centimeters) apart from a wall so it does not block air inlet or outlet.
  • Close doors and windows. Keeping your doors and windows open will decrease the effectiveness of your dehumidifier in that area and may also raise your energy bill.DeLonghi DD45PE 45-pint Dehumidifier with Patented Pump
  • Wait for at least 10 minutes to power your dehumidifier back on after turning it off. Some dehumidifiers have an automatic time delay before they start running again. Powering your dehumidifier off and on right away may cause your dehumidifier’s compressor to overheat.
  • Clean the dehumidifier regularly. If it has a filter clean it at least once per year. Clean the filter as the manufacturer has stated in the user manual.
  • When emptying water tank, scrub the inside of it with a brush using soap and water or use a disinfectant spray and paper towels.
  • Oil your dehumidifier’s fan motor on a regular basis using 3 drops of lubricating oil to keep your fan running smoothly and quietly.
  • Dehumidifiers can last from 3 to 15 years. Performing the recommended maintenance and keeping your unit in great condition improves lengthen the operating lifespan.

Afterword

I hope this guide helped you. I will not get offended if you didn’t read it.

Hope you have much more understanding about dehumidifiers. What next? You can continue with my dehumidifier comparison charts and reviews. I have lots of valuable information in these pages. Just use the links below to read them.

 


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My name is Ryan. I have had a hard time dealing with my allergies. Happily, I found that an air purifier was effective to ease my allergy symptoms. I spent a lot of time researching the best air purifier. I know how hard it can be to find the suitable one.

During the reading period, I also read a lot about humidifiers and dehumidifiers. I learned the mechanisms behind the technologies as well as the manufacturers and organizations within the industry.

I now feel convinced that I have built a guide that shows you all you need to know about air purifiers, humidifiers, and dehumidifiers. So I came up with the idea of creating this website.

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