4 Best Dehumidifier for Greenhouse: Reliable and Robust Performance

Humidity and greenhouse, don’t go well together. Whether it’s from excess moisture in the soil or dripping from the ceiling, any excess moisture can become a breeding ground for diseases.

Unless you want to uproot all your plants due to bacterial infestation, the ideal choice is to get a dehumidifier. The problem comes with choosing the right one.

The best dehumidifier for greenhouse varies on a lot of factors such as room size, budget, power efficiency, and so on. And choosing the perfect one from a sea of products can be one mammoth of a task.

Lucky for you, I’ve done all the homework beforehand. Apart from reviewing the top greenhouse dehumidifiers, I’ll explain the factors to consider when buying a dehumidifier.

So, without stretching this any further, let’s start-

Comparison of Our Top  Dehumidifier for Greenhouse

01. Alorair Basement/Crawl Space 55 Pint Commercial Dehumidifier

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The AlorAir Sentinel HD55 might not have the looks but it’s got everything to tackle any kind of humidity problem in small greenhouses. But it doesn’t deceive you when it comes to its affordable price rate.

The Sentinel HD55 comes with a maximum airflow of 130 CFM rated at 120 PPD(55 pints). However, there’s no condensate pump inside.

With a weight of about 57 pounds and a dimension of 12.2” x 13.3” x 19.2”, this compact and lightweight dehumidifier can cover any 1300 sq ft greenhouses.

Other than all the basic stuff, you can expect it to offer extreme water resistance. And it goes without saying it’ll operate even in the lowest temperatures thanks to its coated coils.

When you think of a low-maintenance dehumidifier, the AlorAir Sentinel HD55 manages to stay at the top without much hassle. The easy maintenance and compact size make it a perfect choice for small greenhouses. Although you could get a couple of these and set them up at different places if you need more.

At this price range, there’s no better alternative to the ALORAIR Basement/Crawl Space Dehumidifiers Removal 120 PPD. Thanks to its reliable performance, you’ll tackle humidity and mold growth in a care-free manner.

Pros

  • Energy Star rated dehumidifier with robust performance
  • Comes with automatic humidistat control
  • No problem with operating at low-temperatures
  • Compact and lightweight

Cons

  • Might require multiple dehumidifiers for large greenhouses

02. Aprilaire – 1830Z 1830 Pro Dehumidifier – Up to 3,800 sq. ft.

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Aprilaire has been in the dehumidifier market since 1954. Since then, they’ve been winning people’s hearts with impeccable products. And I’m glad to say the Aprilaire 1830 Pro is no exception.

Weighing at 67 pounds, it’s a little heavier than the AlorAir Sentinel HD55. As a matter of fact, the 25 x 12.5 x 14.5 inches dimension is bigger too. The interesting part is even though it’s not double in size but it can cover about 3800 sq ft of area, which is more than double of the Sentinel 55.

This powerful dehumidifier can extract up to 9 gallons or 70 pints of water every day. On top of that, the auto-drainage makes maintenance as easy as it gets. The included filters won’t last you forever but don’t worry about that unless you’ve continuously used them for a year or so.

I do like how they’ve added a nice little display. The display is rather small and doesn’t do much but it’s a convenient way to see what the stats are. Speaking of monitoring, the dehumidifier runs at 51 dB.

For a 160 CFM airflow dehumidifier, 51 dB means you’ll hardly notice it’s running. Although that’s what you’re paying for. Aprilaire dehumidifiers don’t come cheap. Even though the service they offer is top-notch, the price might leave a small hole in your wallet.

Pros

  • Covers a vast area of 3800 sq ft
  • Energy-efficient operation
  • Operates at only 51 dB
  • Easy to install

Cons

  • Not ideal for lower temperatures

03. Ecor Pro 200 Pint Portable Commercial Industrial Grade Desiccant Dehumidifier


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The Ecor Pro EPD200 has got what it takes to bring in continuous fresh air for greenhouses up to 2000 sq ft. The rugged dehumidifier with its automatic humidistat will maintain optimal humidity even when the temperature gets as low as -4-degrees F.

Because of the stainless steel construction, it works in all conditions regardless of whether there’s heat or not. Speaking of heat, the dehumidifiers come with no compressor, pumps, hoses, or water containers so to speak. As it extracts all the moisture through the vents, there’s no need for those things.

The EPD200 desiccant dehumidifier comes with 309 CFM of airflow capacity, allowing it to remove 95 pints every single day. When you compare it with other dehumidifiers on this list, only the Dri-EAZ F413 comes close to its performance.

Overall, there’s no doubt about the performance of this study dehumidifier. The only concern is the price tag. Even though it has impeccable capabilities, the higher price tag might chase away some people.

Pros

  • Built for industrial-level performance
  • Capable of performing at lower temperatures
  • Easy mounting options
  • Quiet operation at 58 dB

Cons

  • Higher price tag

04. Dri-EAZ F413 Revolution LGR Compact Portable Dehumidifier


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The Dri-EAZ F413 might look like it’s less capable than the previous dehumidifiers models. But the models don’t stand a chance against the 180 CFM airflow and 7000 sq ft coverage of this robust dehumidifier.

You can rely on it to remove about 80 pints or 12 gallons of water every day. Surprisingly, it gets up to 17.3 gallons/day when the temperature and humidity is particularly high.

Unlike affordable dehumidifiers, this unit comes with interactive touch controls and a built-in thermostat. If your greenhouse is already suffering from moisture problems, don’t worry as the specially formulated water damage design will help to recover the damage.

Even if you somehow water too much on the plants, the dehumidifier will take care of it with its Dri-Eaz airmovers to evaporate the moisture in no time. There’s no doubt this machine shines when it’s in confined spaces like greenhouses.

That said, the Dri-EAZ F413 proves that lightweight and compact dehumidifiers can deliver commercial-grade performance without jacking up the price too high. I’m not saying it’s the most affordable one out there. But as far as greenhouse dehumidifiers go, there’s a lot of value for money.

Pros

  • Designed to use in large spaces
  • Interactive touch control panel
  • Keeps out ice formations allowing it to operate in lower temperatures
  • Comes with reusable(3 times) 3M HAF filter

Cons

  • Pricier than most dehumidifiers

How Do You Dehumidify a Greenhouse?

Water, heat, and humidity, by maintaining these three factors, you can ensure proper growing conditions in your greenhouse. But it’s not as easy as it seems. Let’s start and you’ll know what I mean-

Cultural Practices

Controlled Watering: Overwatering is never good for any kind of plant. Use enough water but make sure there’s no excess water on the water. Moreover, it’s always better to water early in the day. That way there’s enough time for the water to dry off.

Plant Spacing: Placing the plants too close to each other causes the trapped air to generate moisture, which later on increases the humidity. Apart from that, try to use mesh benches for better air circulation.

Weed Control: More weed means more leaves. Apart from sucking in all the valuable nutrients, weeds also contribute to increasing the humidity. The less weed there is, the better it is.

Bottom Heat

Generating bottom heat gives you an upper hand in dealing with humidity. As a general rule, heated air moves up creating air circulation. Along with keeping the surface warm, it helps to dehumidify the area.

Anti-drip Plastic

It was the early 1960s when people first started using polythene for covering wooden greenhouses. Since then there have been a lot of advancements, anti-drip plastics being one.

I could talk about these the whole day but if you’re serious about dehumidifying, I’d advise you to look into the matter.

Combination of Heating and Ventilation

If you plan on doing either heating or ventilation, you won’t get good results. Without ventilation, the heating would rise much above the optimum levels and not to mention the increased heating costs.

On the other hand, only ventilation would lower the temperature too much. Continuing a heating and ventilation cycle 2-3 times early in the morning and evening is adequate to maintain optimum growing conditions.

What Should Be the Humidity Level in a Greenhouse?

In short, there’s no single ideal humidity level. To tell you the truth, it depends on the temperature of the greenhouse. Here’s a quick chart with different temperatures and their ideal humidity level-

What Factors to Consider When Buying a Dehumidifier for Greenhouse?

Buying a dehumidifier is not as simple as getting some groceries. You need to consider the factors carefully as you’ll be spending a hefty amount of money. With that in mind, I’ve come up with a couple of factors you need to consider before you pull the trigger-

Capacity

In short, the capacity indicates how much the dehumidifier can extract from the greenhouse. If it were up to me, I’d say this is the first thing you should look out for when buying a dehumidifier.

The confusion arises as some manufacturers display two different capacities (maximum capacity and AHAM).

Greenhouse dehumidifiers are in a sense commercial dehumidifiers. So, most of the time, you’ll see they have a much higher maximum capacity than the AHAM capacity.

I know this all sounds too technical. So, let me clear it out for you with a table-

Power and Energy Efficiency

Greenhouse dehumidifiers can draw up plenty of electricity. Requiring 5-15 amps of power and running up to 1500W, they’re still one of the lowest power-consuming HVAC machines.

But you’d have to keep it on for a longer period of time. That’s why you need to consider how much it’ll cost you.

Here’s what an energy-efficient powerful dehumidifier should cost you-

Suppose, a 2L/kWh dehumidifier uses $0.25 of electricity to extract 1 gallon of water from the greenhouse(the average kWh price is 13.19 cents or $0.1319).

Now, this is an example of energy-efficient dehumidifiers. I hope you can figure out that most dehumidifiers are quite inefficient at this.

You’re not getting a dehumidifier for a single. Do some smart calculations and you’ll benefit in the long run.

High Air Flow and Low Noise Level

In a perfect world, the ideal dehumidifier would create the least noise with maximum airflow. But it’s not a perfect world, so you’ll hardly see robust dehumidifiers creating minimal noise. As a rule of physics, more airflow will result in a higher amount of noise.

Be that as it may, try to look out for dehumidifiers that can generate 250 CFM airflow at below 55 dB noise.

Built-in Humidistat

Modern dehumidifiers come with a built-in humidistat which allows you to monitor the humidity much easily. As you’ll be getting a dehumidifier for something as sensitive as a dehumidifier, the more monitoring features you have the better it is.

Low Maintenance

No matter how you see it, greenhouse dehumidifiers are in no way portable machines. It’s not possible to service these things every single day or even every week.

So, look out for low maintenance features such as automatic drainage. This allows the dehumidifier to continue running even when the storage basin gets filled up.

Final Verdict

So, that’s a wrap of my take on greenhouse dehumidifiers. If you’ve been around till now, you know that it’s not really possible to point out the best dehumidifier for greenhouse.

From room size to budget, it depends on a multitude of factors. Be that as it may, no need to worry if you can’t figure out what’s the right model for you. Head over to the comment section below and I’ll fix your problem in a jiff.