Growing plants inside a grow tent requires proper care through every stage. Different plants thrive in different environments. Humidity and temperature are essential in a plant’s health and ensuring it is supplied with the right nutrients.
Low humidity can dry the plants while high humidity encourages the growth of mold and other potentially harmful organisms. To solve moisture problems in your grow tent, a dehumidifier is a beneficial addition to your growing system.
If you’re looking for a dehumidifier for a 4×4 grow tent, you can choose from various types and sizes based on the kind of plants and the levels of moisture inside. We’ve picked six different dehumidifiers you can choose from below and provided all the necessary information to help you make a decision
Best Dehumidifiers for 4×4 Grow Tent
Best Grow Tent Dehumidifier: Pro Breeze Mini Dehumidifier
For a grow tent as small as 5×5 feet, this Pro Breeze electric mini dehumidifier is a great choice. It uses the Peltier effect or thermoelectric cooling technology and comes in a compact design. It works by passing the moist air through the heat sinks on each side of the Peltier module where the moisture condenses to form water droplets.
This compact dehumidifier for grow tent has a maximum moisture removal of 9 ounces (250 ml) per day. It can hold up to 16 ounces (450 ml) in its tank, which means it can hold at least two days worth of moisture collected. This unit can cover a small grow tent or grow room around 150 to 215 square feet. It is useful for many different applications in small rooms including bedrooms, bathrooms, and closets due to its quiet operation.
It is easy to operate with a simple one-button control for the power switch. It also has the auto shutoff feature for when the water tank is nearly full and the corresponding LED indicator light to alert the user. It is incredibly easy to use and maintain. When the water tank is full, simply slide it out from the bottom part of the unit, pull the drain plug, and empty the contents into your sink or drain
It runs on only 23 Watts, so you can leave it running 24/7 during humid days and barely make a difference in your bills. On the downside, this unit is not built for heavy-duty use. Most Peltier dehumidifiers are designed to work under average conditions for shorter periods. They usually work best at temperatures between 59℉ and 89℉. In any case, for a small room and grow tents with minimal moisture, Pro Breeze is one of the best mini dehumidifiers you can find.
• Small, lightweight, and portable
• Low power consumption
• Whisper quiet operation
• User-friendly controls
• Manual draining
• Only ideal for warmer climates
Ivation IVADM10 Thermo-Electric Dehumidifier
Ivation brand offers a wide selection of dehumidifiers for different purposes and room sizes, from mini Peltier units, desiccants, to high-capacity refrigerant dehumidifiers. For tiny spaces like a grow tent or grow room, you need Ivation’s smallest dehumidifier, the IVADM10. It is ideal for any space within 1,100 cubic feet or around 90 to 130 square feet. It removes up to 8.5 ounces (250 ml) and holds up to 17 ounces (500 ml) in its tank so you only have to empty it at most every two days.
This Ivation dehumidifier also uses Peltier technology for a whisper-quiet operation and low-energy consumption. Like Pro Breeze, this unit features just one button for the on and off function. It is also equipped with the auto shut-off feature and LED indicator light for when the water tank is almost full. To drain the water, slide the tank along the front of the dehumidifier, pull the plug out, then drain the water into the sink or drain.
This small dehumidifier also features the standard auto shutoff to prevent water overflow, and an LED indicator light to alert you when the tank becomes full. The simple design comes with a single button for the on/off switch on the top. The unit is easy to use and even easier to maintain. To empty the tank, simply slide it out from the front of the unit, pull the plug, and pour the water into your sink or drain. For optimum performance, always rinse the tank before placing it back into the dehumidifier.
Running on 22 Watts, this Ivation dehumidifier consumes around 0.52kW after 24 hours of use. Similar to any Peltier dehumidifier, this unit works best at temperatures between 59°F and 89°F and it will not operate below 41°F.
• Small, lightweight, and portable
• Low energy consumption
• Whisper quiet operation
• User-friendly controls
• Manual draining
• Only ideal in warmer climates
Seavon Dehumidifier with Remote
Another brand known to manufacture a variety of mini dehumidifiers is Seavon. One of its “large” Peltier units is this remote control-operated dehumidifier. It can remove up to 26 oz or 760 ml of moisture in areas up to 560 square feet. It has a large tank capacity that can hold up to 68 oz or 2 liters of water.
This Seavon unit may be bigger than most Peltier dehumidifiers, but it uses the same thermoelectric technology for quiet and efficient dehumidification. It is the best dehumidifier for 4×5 grow tent. It is built similar to a small compressor-based dehumidifier with the air intake on the back and exhaust on the side. It also features two fan speeds and dimmable lights.
However, it still offers the the unique feature of Peltier dehumidifiers: one-button onboard control for the power switch. In addition, this unit includes a magnetic remote to control the lights and fan speed. In Sleep mode, the fan is set to low speed automatically. One potential disadvantage is if you lose the remote control, there is no other way to control the fan. Seavon also has the auto shutoff function and a full tank indicator. To drain the water manually, simply remove the tank from the side of the unit.
This large Peltier dehumidifier has a handle on the back for portability. You can place the unit in the room outside your grow tent for optimum humidity control. Running on 72 Watts, it is one of the best, most efficient options for indoor growing areas with moderate humidity issues.
• Light and portable
• Low energy consumption
• Whisper quiet operation
• User-friendly controls with remote
• Not the best quality according to reviews
Eva-Dry E-333 Wireless Mini Dehumidifier
For a small grow tent with minimal moisture problems, a small, wireless dehumidifier may be all that you need to keep humidity in check. The smallest dehumidifier on our list is the Eva-Dry E-333 renewable mini dehumidifier. It is a desiccant unit which uses silica gel beads to extract moisture from the air in a tight space. The silica gel changes color from orange to green once they have absorbed the maximum capacity of 4 to 6 ounces, which usually happens in 20 to 30 days.
It is completely safe and non-toxic and the best thing is it doesn’t require batteries or electricity to start working. When it’s time to recharge, just plug the unit into the wall socket to dry out the moisture for 8 to 10 hours. If this is too long for you, there are many other units that can fully recharge for a much shorter period. You can do this repeatedly and reuse the silica gel for up to ten years.
The Eva-Dry is light and portable and can fit in any grow tent or box. You can even use it in other small spaces in your house that need dehumidifying, such as your kitchen pantry, bathroom cabinet, or closet. As the name suggests, it can only cover up to 333 cubic feet. For maximum coverage, you can avail the Eva-dry E-33 in twin packs or the slightly bigger E-500 unit. Note that this type of dehumidifier does not affect humidity levels significantly but are only meant to reduce moisture content.
• Compact and portable
• Requires no batteries or cords
• Renewable and eco-friendly
• Small capacity
• Can take a while to recharge
Afloia Cordless Dehumidifier
Similar to the Eva-Dry, this cordless Afloia dehumidifier works without batteries or electricity. This is made possible using renewable silica gel technology that can extract moisture from the air up to 4 oz or 100ml. This unit is recommended for tiny spaces up to 54 square feet. The cylindrical design ensures larger area of contact with moist air for faster and more efficient moisture removal.
The silica gel beads turn from orange to green once the maximum capacity is absorbed. You can monitor this through the top window. To recharge the dehumidifier, you don’t need to plug the dehumidifying unit directly. The dehumidifier stick itself is cordless and the PTC heating base is wired and plugged in to renew the silica gel. You only need to place the dehumidifier on the heating base for about two hours.
The base blows warm air out through the vents and the indicator light will flash green. When the recharging process is complete, the light will flash white and the dehumidifier will be on standby mode. Due to its design, this dehumidifier is also ideal for use in storage spaces, closets, RVs, cars, and boat cabins with minimal humidity problems. Afloia comes with a one-year warranty.
• Light and compact
• Wireless operation
• No batteries required
• Fast recharging process
• Small capacity and coverage
Best Dehumidifier for Grow Room: Vremi 22-pint
For extremely humid rooms outside your 4×4 grow tent, you need an energy-efficient dehumidifier to remove large amounts of moisture before it can cause any problems to the health of your plants. The Vremi Moisture Maniac dehumidifiers come in a range of sizes suitable for many different needs. The smallest unit pulls up to 22 pints of moisture from the air in spaces up to 1,500 square feet.
To guarantee its high performance and efficiency, Vremi is Energy Star certified. Like most regular dehumidifiers, it features a digital control panel with an adjustable humidistat. Some of its features include Turbo mode for maximum moisture removal and Comfort mode to automatically adjust the humidty setting based on ambient temperature in the room. Standard features like auto shut-off, auto restart, and auto defrost functions are also present.
This portable dehumidifier is built with wheels and side handles for easy movement. It has a 0.8-gallon water tank that you will have to manually empty a couple of times a day. Alternatively, you can use a drain hose (not included) to attach to the hose outlet at the back for continuous gravity draining.
One problem with compressor-based units like Vremi is the loud buzzing noise coming from the compressor. It doesn’t affect the dehumidification performance by any means, but it can be annoying for some. However, if you’re going to use the unit away from your living or sleeping space, then this Vremi dehumidifier can really do well for humidity control in highly humid areas.
• Energy Star certified
• Large capacity and coverage area
• Easy-to-use controls
• Continuous draining option
• Higher noise level than other dehumidifiers for grow tent
How Does Humidity Impact The Health of Your Plants?
Humidity plays a significant role in a plant’s growth. If moisture levels are too low, the plant roots have to work harder to take the water needed for growth. If moisture in the air is high, the plant drinks water through the leaves and reduces the work for its roots, taking less of the nutrients it needs from the soil.
In excess, humidity can prohibit the development of other organisms such as mold and mildew. These types of fungi directly affect photosynthesis as they can prevent the absorption of water, light, and air through the leaves. Once an area is infested with mold, there is a high chance that it spreads to the rest of your plants.
When you see pests such as aphids, ants, caterpillars, or spider mites, that may also mean you have excess moisture in your grow tent. Furthermore, if you find puddles of water before even watering, this can damage your plants and make the soil more hospitable to unwanted organisms.
What Causes High Humidity in a Grow Tent
The main ingredients of humidity are heat and water. Therefore, when there is excess water and heat present in the environment, it results in high levels of humidity. When you water your plants, they absorb it and release the excess to the air through respiration. So, if you overwater your plants, they also produce excess moisture. Improper ventilation and lack of airflow also add to the humidity in your grow tent.
How To Maintain The Humidity Level In Your 4×4 Grow Tent
Before using a dehumidifier for your grow tent, here are some simple ways you can minimize moisture levels and maintain proper relative humidity in your grow tent.
First, ensure that it is properly insulated to maximize the energy efficiency of your electrical units such as heating and lighting inside the tent. This also helps maintain ideal temperatures during extreme weather conditions.
To prevent excess moisture from accumulating, do not over water your plants and drain any standing water in the area. Put enough space between your plants to promote proper air circulation.
It’s also best to increase ventilation inside the tent or in the room around it. If possible, install a fan in combination with your dehumidifier. If there is a grow light, ensure that the heat is just right or use it only during the coolest time of day.
Choosing the Best Dehumidifier for Grow Tent
Finding the best dehumidifiers for grow tent depends mainly on the type of plants you’re growing and the current conditions in its environment. To maximize the efficiency of your grow room dehumidifier, you must first understand the following factors before you make a purchase.
There are two main types of dehumidifiers based on the moisture removal method they use: the refrigerant and desiccant. For mini dehumidifiers, another method is also used, called the Peltier effect.
For a small space like a 4×4 or 5×5 grow tent, desiccant dehumidifiers are usually the best option. This dehumidifier uses some type of hygroscopic chemical or desiccant like silica gel to extract moisture from the air. Depending on the desiccant material used, it can be renewable or disposable after absorbing water.
Renewable desiccant dehumidifiers like the Eva-Dry and Afloia units above don’t need electricity or batteries to work. You can put them anywhere you need and they immediately start extracting moisture from the air until they have reached maximum capacity. In this case, you will need to recharge the unit either by plugging it or by putting it in a microwave to dry out the moisture.
Mini dehumidifiers for grow rooms and other small spaces use the Peltier effect or thermo-electric cooling technology. A Peltier dehumidifier mainly consists of two heat sinks on each side of the Peltier module, one cold and the other hot, and a fan to facilitate the air movement. They are typically small and simple to use with a single button to control operation.
The refrigerant or compressor type of dehumidifier is most common in household use. They work with a similar principle as an air conditioner which uses a compressor to pump the refrigerant to the condenser and evaporator coils. A fan draws moist air inside and cools it down to remove excess moisture. This type has the largest capacity and coverage and are typically used in large rooms.
The dehumidifier capacity or size refers to the total amount of moisture the unit can extract from the air in one day or until saturation. Mini renewable desiccant units can only absorb around 4 to 10 ounces of moisture within weeks up to a couple of months.
For Peltier units, the daily moisture removal capacity ranges from 8 to 16 ounces for smaller models and up to 35 ounces for the largest models. Higher capacity typically means a larger coverage area. If you have a small grow tent with average humidity, a mini dehumidifier should be more than enough. For smaller grow tents where moisture issues aren’t that severe, you can opt for renewable desiccant dehumidifiers.
This isn’t a factor to consider in mini, renewable dehumidifiers. But for an electric dehumidifier, water is collected in the tank for manual draining. For Peltier dehumidifiers, it is usually big enough to last at least two days up to a week, depending on the humidity levels.
Compressor-based units, on the other hand, give you an option for continuous draining. You won’t need to check the water level and drain it by hand. Just attach the drain hose to the outlet then place the device above a low-level drain and let gravity do the work for you.
Again this isn’t a factor to consider for mini dehumidifiers. But for compressor models, a built-in humidistat makes it more convenient to monitor and adjust the humidity level in the room. The dehumidifier will shut off automatically until your set humidity is reached, then resume operation when humidity rises, thus reducing your energy consumption.
What size dehumidifier do you need for a grow tent?
For 5×5 and 4×4 grow tents, a mini Peltier or desiccant dehumidifier should be enough. If your humidity problem isn’t that serious, you may use a mini desiccant dehumidifier like the Eva-Dry E-333 or the larger E-500. It’s always best to get a more powerful unit than you might need.
Where should you place a dehumidifier in a grow tent?
Ideally, you want to place your dehumidifier where it can cover the entire area and address your humidity problems at its main source. However, it depends on the size of your grow area and the capacity of your dehumidifier. It is recommended to place the unit at a distance from your plants. You can also place it in a closed room outside the tent with a fan to help circulate the air.
High humidity can bring a variety of problems to your plants in a small grow tent. It is important to control the humidity levels when growing plants indoors as humidity plays a critical role in every stage of plant growth. Depending on the size of the area, its current conditions, and your plant requirements, you can find a dehumidifier that is just right for you. Usually, all you need is a mini dehumidifier for grow tents like the top five of six units we listed above. For larger areas, a larger dehumidifier can be used as needed.