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The 5 Best Dehumidifiers (2021)

A dehumidifier can help reduce the humidity levels in your home, preventing harmful bacteria and allergens from collecting in your living areas. In this review, the This Old House Reviews team delves into our top picks for dehumidifiers from Amazon. The products included in this article are available at various home improvement stores, local home centers, and online retailers like Amazon.

dehumidifier in kitchen pantry Amazon

Dehumidifiers are designed to pull water out of the air, creating a more comfortable and breathable environment. Additionally, dehumidifiers can alleviate a number of health issues by restricting the environment where bacteria, dust, and allergens thrive.

Whether you want to reduce high humidity levels in your room or you’re looking to generate cleaner air inside your home, an effective dehumidifier is an important purchase. That’s why the This Old House Reviews team researched numerous online dehumidifiers and created a comprehensive menu to the five best dehumidifiers available online.

Our Process

Dehumidifiers are designed to reduce moisture and improve air quality within the home. The This Old House Reviews team understands the value in a quality and durable dehumidifier for your home, car, or workplace. That’s why we’ve researched dehumidifiers online and analyzed customer reviews to help you find the right dehumidifier for your situation.

Product Summary

Ivation Dehumidifier hOmeLabs Dehumidifier Pro Breeze Electric Mini Dehumidifier ALROCKET Dehumidifier Eva Dry Wireless Mini Dehumidifier
Ivation Dehumidifier hOmeLabs Dehumidifier Pro Breeze Electric Mini Dehumidifier ALROCKET Dehumidifier Eva Dry Wireless Mini Dehumidifier
11 inches x 15 inches x 23.5 inches 15 inches x 10 inches x 20 inches 7 inches x 6 inches x 11 inches 6 inches x 6 inches x 9 inches 9 inches by 8 inches by 3 inches
45.5 pounds 30.5 pounds 2.4 pounds 3 pounds 1 pound
N/A Two-year warranty One-year warranty One-year warranty Five-year manufacturer warranty
2.25 gallons 1 gallon 16 ounces 25 ounces 6 ounces

Dehumidifier Buying Guide

To help you understand the benefits and workings of a dehumidifier, we’ve created a buying guide to walk you through important information you should know before making a purchase.

Why Should You Get a Dehumidifier?

Besides providing a comfortable living or working environment, dehumidifiers typically offer users two benefits:

  1. Keeps important items protected—High humidity in the home (anything over 60% humidity) can cause wood items like hardwood floors, furniture, and cabinets to warp. Wood is particularly susceptible to warping because of its weak grain lines which twist after moisture is absorbed.
  2. Removes harmful bacteria—Bacteria, dust mites, and other harmful microorganisms thrive in high humidity. When humidity levels drop, they’re unable to survive because of the lack of moisture in the air.

Factors to Consider When Purchasing a Dehumidifier

Dehumidifier size

Dehumidifiers are sized based on the amount of water they can remove from the air in a set amount of time, typically within 24 hours. This is the benchmark that determines the size of a dehumidifier, because usually the more moisture it can take from the air in a given time period, the larger the size.

Dehumidifiers come in multiple sizes that fit the needs of various rooms throughout the home. You shouldn’t sacrifice efficiency for cost, but it’s also important to avoid purchasing the largest model just because you think it will perform the best.

For example, the Eva Dry Wireless Mini Dehumidifier is well-suited for tight spaces like closets or cabinets because of its compact and wireless design. However, if you’re looking to dehumidify your living room, the hOmeLabs Dehumidifier might be a better choice because of its gallon collection tank and automatic shutoff feature.

Tank and drain hose

The moisture that dehumidifiers pull from the air collects as water in a storage tank. Typically, dehumidifiers pull more water out of the air daily than their tank can hold, which requires you to empty the tank several times a day.

If you’re looking for a dehumidifier that doesn’t require you to empty its tank, we recommend the Ivation Dehumidifier. This product comes equipped with a 16-watt pump that allows you to drain collected water out of a nearby window or into a sink.

Electronic controls

Some dehumidifiers are simply turned on and left alone to absorb moisture, while other units offer a variety of electronic controls that allow you to set the temperature of recycled air or change your room’s humidity level.

How Dehumidifiers Work

The majority of dehumidifiers are air conditioners that have been modified to draw the moisture out of the air, a process that requires several steps. To better understand the benefit of purchasing a dehumidifier, it’s important to understand how they work to make your home’s air quality better.

  1. The dehumidifying process begins when a fan brings in warm, moist air from your home.
  2. The air is cooled by passing over a series of pipes cooled by freon, which is continuously circulating throughout the pipes.
  3. As the pipes cool the air, moisture is pulled from it and drips down into the water collection tank.
  4. The dry air is then heated back up to its original temperature by an electric heater before being blown back into the room.
  5. As the dehumidifier pulls water from the air, a plastic float usually rises with the water in the collection tank. Once the tank reaches capacity, the float trips a switch that shuts off the fan and prevents additional water from collecting.
  6. Before the dehumidifier can start up again, the tank will need to be removed, emptied, and replaced back inside the unit.

Note: While this is an outline of how dehumidifiers work, not all models follow this exact process.

Tips For Use

  • Dehumidifiers can function as air conditioning units in a smaller space, such as a bedroom or den. This can be done if you own a unit where you can change the temperature of the released air. For example, if the room temperature is 75°F, you can set the dehumidifier to release air at 70°F to help save electricity.
  • Ensure you empty your collection tank before bed, which will allow the dehumidifier to run while you’re asleep at night. That way, you’ll be able to wake up to dry, clean air.
  • Dehumidifiers are natural places for mold to grow as they trap moisture and condensation inside. Ensure you regularly clean your dehumidifier to prevent mold buildup and keep its recycled air clean.

Frequently Asked Questions About Dehumidifiers

Is it safe to run a dehumidifier constantly?

To be effective, dehumidifiers need to run for an extended period and are designed to constantly run. Most dehumidifiers are equipped with an automatic switch-off, which cuts power when the collection tank is full. This stops the dehumidifier until it’s emptied, giving it time to cool off while reducing its power usage.

When should I turn off my dehumidifier?

Dehumidifiers should be turned off when the room temperature is too low or if the humidity drops to a certain level. It’s recommended to keep your home between 30%–50% humidity. Typically, dehumidifiers can be set to turn off once they hit a certain humidity threshold.

What are the differences between dehumidifiers with a built-in pump and without?

While most dehumidifiers collect absorbed moisture in a tank, units with built-in pumps push the moisture out through a tub and into a connected sink or drain. This hands-free design prevents the need for dumping the collection tank throughout the day. Dehumidifiers with built-in pumps are convenient for units that are in hard-to-reach places or for those that want to avoid lifting a full collection tank.