Best dehumidifier for 4×4 grow tent setups

Find the best dehumidifier for 4×4 grow tent humidity issues and learn other ways to help control moisture when growing weed plants in a small tent.

We’ll help you figure out what size grow tent dehumidifier to buy, discuss features and options to consider, and outline the options of where to place dehumidifiers for best results.

Midea Cube is a 20-pint dehumidifier for 4x4 grow tent setups and can be placed inside or outside of tents.
The compact Midea Cube 20-pint dehumidifier ($179) is powerful enough be placed inside or outside a 4×4 grow tent.

These are the target humidity levels to aim for:

  • Vegetative stage: 40%-60%
  • Flowering stage: 40%-50%
  • Last few weeks or flowering stage: 40% or less

What size dehumidifier for 4×4 grow tent?

The best dehumidifier for 4×4 grow tent setups depends on the severity of your humidity issues and where you intend to place it. There are two options on where to place a dehumidifier for 4×4 grow tent setups:

    • Outside the tent (recommended): For most grow tent moisture problems or in damp climates, use a larger dehumidifier to dry out air in the “lung room” outside the tent which is introduced using an intake fan.
    • Inside the tent: If your humidity problems are minor, a small dehumidifier can be placed directly inside the tent. This isn’t as efficient due to constant ventilation. Watch temperature levels carefully.

Best dehumidifier for 4×4 grow tent setups: outside the tent

Closeup showing transpiration of moisture in a cannabis plant leaf.
Transpiration in a cannabis leaf. Source

Unless you’re running a sealed tent while supplementing CO2, you’re better off running a larger dehumidifier model in the room outside the tent and creating a “lung room” with properly conditioned air.

Humidity levels can vary quite a bit inside 4×4 grow tents filled with bushy plants due to the light on/off light cycles. It’s much easier to maintain the ideal humidity range outside the tent and circulate that air through it.

You will need to keep the air oustide of your tent a bit dryer than your tent’s target humidity level to offset moisture added by transpiration of your cannabis plants’ leaves. You want the air you pull in to be much drier than the air already in the tent.  To quickly rectify an overly damp tent, point the exhaust fan on the dehumidifier right at your tent’s intake fan, forcing really dry air in.

Recommendations for the best dehumidifier for a 4×4 grow tent: outside the tent

Honeywell 20-pint dehumidifier ($200)

The 20 pint Honeywell dehumidifier for 4x4 grow tent setups is perfect for small to medium rooms.The 20-pint Honeywell dehumidifier is a great choice for small and mid-size rooms. It is rated for 1000 square feet and can remove 20-30 pints of water per day.

This 20-pint model has a digital humidistat control, a drain tube, a washable dust filter that doesn’t need to be replaced. It will auto-restart after a power outage which is a very important feature to consider when choosing a dehumidifier for 4×4 grow tent setups. It’s 10.5 x 13.2 x 20.1 inches and weighs 14 pounds.

They also make an upgraded 20 pint Honeywell with wifi that lets you adjust humidity and fan speed settings via wifi, which is great if you’re also using a wifi thermometer/hygrometer to monitor your grow tent remotely and need to make adjustments.

If you’re growing weed in very damp conditions such as a basement you may want to opt for a higher-powered version such as Honeywell’s 50 pint or even their 70 pint version.

The Honeywell 20 pint model is a bit more reliable than some of the cheaper competitor brands in the 20-pint size range.

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hOmeLabs 1,500 SF dehumidifier ($220)

The h0melabs 1500 square foot dehumidifier is perfect to place outside of small grow tents such as a 4x4.The hOmeLabs 1,500 SF Energy Star Dehumidifier is made for medium to large rooms and basements. It removes up to 22 pints of water per day and is Energy-Star certified.

The water storage tank holds one gallon, and it has auto-shutoff when full. An optional drain hose attachment is included, which connects to a 5/8″ garden hose. Use teflon tape for a secure fit.

The unit is 15.2 x 10 x 19.7 inches and weighs 30.5 pounds.

hOmelab’s 1500 square foot model isn’t available with a pump, but pumps are available on their much larger hOmelabs 4500 SF model. But their 4500 SF model is meant for very large spaces, such as basements, and would run very inefficiently in smaller areas.

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Whirlpool 40 Pint Portable Dehumidifier with pump ($230)

Whirlpool 40 pint dehumidifier for 4x4 grow tent with pumpThe Whirlpool 40 Pint Portable Dehumidifier has a built-in pump so you’ll never have to empty a water tank. It is one of the smaller, most affordable models with the built-in pump option.

The pump allows the unit to discharge water upward up to 16 feet to drain out a basement window or into a sink.

It is meant for a 500 square foot room. The digital humidity settings range can be set from 35% to 80%. There are 3 fan speeds and auto-defrost. According to Consumer Reports, the model WHAD40PCW has a tank size of 14.9 pints (1.86 gallons).

It has an easy to clean filter and will automatically restart if power goes out. It weighs 41.78 pounds and measures 12.01 x 15.04 x 25.2 inches.

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Dehumidifiers for inside 4×4 grow tents

Be wary of small dehumidifiers with tiny water storage tanks.
Be wary of tiny water storage tanks.

Placing a small dehumidifier inside a 4×4 tent seems like an obvious solution.

But small units are not designed to remove enough moisture and small reservoirs fill up quickly. Emptying buckets sucks, and the unit shuts off until you do it.

Since exhaust fans should usually be exchanging grow tent air about 1x each minute, the small output of drier air from is quickly pulled out. If ambient moisture levels rise in the room outside the tent small dehumidifiers can’t possibly keep up.

We learned that lesson the hard way. Tiny dehumidifiers don’t do the job properly.

Recommendations for powerful small dehumidifiers placed inside grow tents

Midea Cube 20 Pint Dehumidifier with Smart Wi-Fi ($179)

The Midea Cube 20 Pint Dehumidifier is great cheap option that can be used inside or outside of grow tents. The Cube uses Wi-Fi so you can monitor and control it from your phone or via Alexa. The app has a full water tank alert, preset water tank levels, real-time water and humidity levels, and a predictive bucket fill algorithm.

The Midea Cube wifi dehumidifier has a short nested mode that's perfect for use inside 4x4 tents.The Cube design is unique in that you can adjust the height. It has a no-bucket option that lets you remove the water tank and use the drain hose (included) to drain out of the tent to a floor drain.

In the nested setting it’s 13.5 x 13.5 x 13.39 inches, perfect when you need a powerful small dehumidifier inside a 4×4 grow tent under the plant canopy. When fully extended the bucket holds 3x more water. The air intake is multi-directional, a plus in grow tents.

Note that the Cube’s 20 pint model doesn’t include a pump, the drain is gravity only. Midea’s 50 pint Cube has a built-in pump but it’s meant for much larger rooms and way too big for inside a small tent.

The 20 pint Cube is ENERGY STAR rated and runs at 230 watts. The digital controls let you adjust humidity from 35% to 85%. It covers areas up to 1,500 Square feet.

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Haier 20 Pint Dehumidifier ($139)

Haier 20 pint dehumidifiers for 4x4 grow tentsThe Haier 20 Pint Dehumidifier model is the best cheap dehumidifier for 4×4 grow tent usage. It has enough power and a large enough tank to keep relative humidity (RH) levels down.

Haier’s Smart Dry feature compares the set humidity level with the actual humidity in the tent and automatically adjusts the fan speed accordingly. This is helpful to alter airflow if you’re seeing a large humidity variance in your light and dark cycles.

The front-loading bucket has a large capacity of 1.8 gallons, with a 10-second alarm when it gets full (although good luck hearing it over the sound of your inline fans). There is a continuous drain option, you can attach a hose about halfway up the left side. This unit 9.8 x 13.4 x 19.3 inches.

Note that the 20-pint Haier is meant for moderately damp locations. For wet environments, consider placing their much more powerful 50-pint model outside the tent.

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A word of warning about small dehumidifiers in grow tents

A drain hose allows you to direct water into a drain outside of your grow tent.
Setting up a drain hose will prevent you from constantly emptying buckets of water.

Be wary of online product descriptions for small dehumidifiers. Pay attention to how much water they can remove per day and tank size. We learned the hard way that the small $100 units looked like they’d be perfect for a 4×4 tent only to find they couldn’t keep up.

Smaller models usually lack a continuous drain option so they’ll shut off unless you constantly empty the small buckets.

Some small models run continuously until full, in which case you’ll need a humidity controller (such as Inkbird, $43) to turn them on/off as needed.

It has an adjustable humidistat, 3 fan speeds, auto-restart when power goes out, and auto-defrost.

Inside the tent: dehumidifier placement tips

Dehumidifiers can go directly on grow tent floors, placed out of the way of potential issues with spilled water. Position it so the unit’s vents can circulate air, don’t put it in a corner with the intake flat against a tent wall. Don’t point the dehumidifier’s airflow directly at weed plants if you can avoid it.

Prop it slightly if you need to raise the height to facilitate water drainage through a hose. But try to keep it low.

Your tent’s exhaust system should be designed to intake fresh air from the bottom and exhaust warmer, humid air from the top. If it doesn’t, here’s how to correct it. Placing the dehumidfier low allows that dryer air to get pulled upward as the warmer humid air above is removed.

If you do place a dehumidifier inside your tent, make sure to cover any lights on the unit with black Gorilla tape.

Choosing the best dehumidifier features

The Emerson Quiet Cool 20-pint dehumidifier has wifi controls to adjust settings from your phone app.
The 20 pint Emerson Quiet Cool dehumidifier has wifi controls that make it helpful for use in grow tents.

When choosing a dehumidifier for your grow tent, there’s a few things to keep in mind.

  • Dehumidifiers are rated by how many pints of water they are able to remove from the air. A 4×4 grow tent is only 12 square feet, a very small area. But if much of that space is filled with transpiring leaves, it can get humid quick.
  • Small dehumidifiers have tiny reservoirs, so you may find yourself having to empty them often or they’ll shut off.  Emptying buckets sucks. Larger models with bigger reservoirs reduce the chance it will shut off inadvertently.
  • Look for models that allow you to attach drainage hoses reduce this hassle.
  •  A dehumidifier with a pump will let you reach elevated drains.
  • One of the best dehumidifier options for 4×4 grow tent usage is bluetooth connectivity so you can monitor and track levels on your phone.
  • Look for models with multiple fan speeds and settings for target humidity level. Some cheaper models are designed to run continuously until full, while others can shut off when they reach a set level.

Other ways to lower humidity in 4×4 grow tents

Before you buy a dehumidifier there’s a few things you should try first to lower humidity in your grow tent.

An inline fan with a humidity controller can help alleviate humidity problems in 4x4 grow tents.
An inline fan with a humidity controller (such as this 4″ AC Infinity fan, $119) can prevent humidity problems in 4×4 grow tents.

Increase your tent’s exhaust fan (and add a filtered intake fan if you don’t have one) to more quickly remove moist air. Use a humidity fan controller to turn the exhaust fan on as needed to keep things within suitable range. Learn more about grow tent ventilation setup and how to find the best fan for a grow tent.

For 4×4 grow tents this usually will be adequate to lower humidity levels. But for some growers the air outside their tent is too damp to control tent moisture levels and a dehumidifier is the solution.

A tip for new marijuana growers: try to address grow tent humidity issues before the flowering phase begins. High humidity during mid and late flowering brings a big risk. You don’t want to watch your buds get moldy when they’re almost ready to go.

Need more info on picking a humidifier for a 4×4 grow tent? Check out our grow tent dehumidifier guide. For smaller tents, try our 3×3 grow tent dehumidifier guide.

If you are just getting started growing weed, see our complete instructions and tips to create the best possible environment for growing weed in our 4×4 grow tent setup guide.

Find the Best dehumidifier for 4x4 grow tent
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Find the Best dehumidifier for 4x4 grow tent
We'll help you figure out what size grow tent dehumidifier to buy, discuss features and options to consider, and outline the options of where to place dehumidifiers for best results.
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Happy Pot Farmer
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