In a Nutshell:

The Quest CDG174 Dehumidifier is a rugged, portable, amazing dehumidifier with an impressive daily extraction rate, offered by one of the best companies in the business today. Recommended fo anyone. Don’t settle for anything but the best!

Feature Set
Ease of Use
Value for the Money
Brand Reliability*

Overall Rating

* Brand Reliability is a measure of the strength and longevity of the brand, which by extension, is a measure of the level of support you can expect.


  • Effective moisture removal
  • Efficient air purification
  • High-quality components
  • Suitable for recycling water


  • Expensive
  • Limited features and functionalities
  • Not fancy or visually appealing
Quest CDG 174 Dehumidifier

Recommended For: Anyone. Don’t settle for anything but the best!

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Do you have a large indoor growing space or some other location on your property with an enormous amount of moisture? Are you looking for a rugged, robust, top-quality dehumidifier to help you get a handle on it? If you answered yes to either of those questions, then you’re going to love this review of the Quest CDG174 dehumidifier.

Quest is one of the finest and most respected companies doing business in the industry today, and their products are among the best and most efficient you’ll find anywhere. The CDG174 is an amazing, portable dehumidifier you can roll into even the most humid environments and quickly begin turning the tide.

In the sections that follow, we’ll tell you all about why this remarkable machine belongs to your shortlist for consideration. Even if you opt to go in some other direction, we think you’ll agree; Quest sets the standard that every other company in the business aspires to match. Let’s take a closer look at what this model brings to the table.

An Overview of the Quest CDG 174 Portable Dehumidifier

Before we get into the specifics, let’s start with a quick look at the core stats that define the Quest CDG174 dehumidifier. Here are the basics:

  • Overall Product Dimensions: 23” x 40” x 20”
  • Product Weight:  135 pounds
  • Extraction Capacity: 176 pints per day
  • Reservoir Size: NA
  • Power Cord Length:  25 feet
  • Included Drain Hose Length: 33’
  • Power Supply:  1200 Watt (max)

As you can see, this unit is a beast with a massive daily extraction capacity. Even better, unlike so many companies, Quest doesn’t skimp when it comes to the length of the power cord or the included drain hose.

With a 25’ power cord and a 33’ drain hose, you’ve got tremendous flexibility in terms of where you want to put the unit and where you want to direct the water it pulls from the air.

Features of Quest CDG 174 Portable Dehumidifier

Grey Color, Quest CDG174 Dehumidifier, Rightfront

Water Extraction

Quest does make a few dehumidifiers with a greater daily extraction limit, but not many. This is one of the biggest you can get. If you have a large growing operation, our recommendation would be to get Quest’s rack or shelf mounted units and one of these to serve as a mobile backup, allowing you to put it where you need it most and shift it around as your needs evolve over time.

Filtration System

In addition to its massive moisture extraction capabilities, the Quest CDG 174 Portable dehumidifier also has an impressive filtration system. It’s not quite as robust as Quest’s rack/shelf mounted overhead dehumidifiers, which come with MERV-11 filters, but these units are equipped with MERV-8 filters, which are better and more effective than just about anything else you’ll find on the market today.

Control System

Using the device is a lesson in simplicity. You’ll find a simple dial on the unit for humidity control. It ranges from 20% to 70%. Dial in the value you want the unit to hit, make sure your drainage hose is porting the water where you want it to go, turn it on and find something to do for a little while. In the vast majority of cases (depending on the size of your grow room), you’ll see the relative humidity on your hygrometer begin to plunge toward your target value. This unit doesn’t mess around.

The other controls on the unit are self-explanatory but here’s a quick summary:

  • The Pump Purge Button – The pump normally runs every four minutes, but if you want to purge the pump, simply push this button once to get the pump to run for up to 20 seconds. Press and hold if you want it to run for up to 30 seconds.
  • The Hours Button – The display next to this button shows how long the unit has been plugged into a power supply. To reset the job hours, press and hold the hours button for 5 seconds while the unit is running.
  • The Defrost Light – The unit has an auto-defrost feature, and this light will be on if and when the unit enters defrost mode, just to let you know.

Pros and Cons gdm30 Dehumidifier

This unit is kind of like a great white shark. It doesn’t have a lot of bells and whistles. It’s not fancy. It does two things, and it does them really well. It sucks the moisture out of the air like nobody’s business, and it purifies the air in whatever space you put it in.

If that’s what you’re looking for, this unit belongs on your shortlist of options to consider, but fair warning, it is expensive. It’s made of robust, top-quality components, and as such, you’re going to pay a premium for it.

On the other hand, if you’re interested in recycling and reclaiming your water, this is the kind of high-quality unit you want because you won’t have to worry that the unit will leach copper or aluminum into the water you’re extracting. Just route it to a collection barrel and reuse it as needed.

Quest CDG174 Dehumidifier Review Conclusion

Quest makes some of the best high capacity dehumidifiers on the market today. Even if you suffer from a bit of sticker shock when you head to the company’s sales page, and your impulse is to gravitate to something cheaper, we’d recommend saving up to get the Quest CDG174 dehumidifier. It is a solid performer and worth every penny. Highly recommended.

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