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The 3 Best Humidifiers for Greenhouses

Maintaining constant and healthy levels of humidity is essential for healthy plants. When the humidity levels drop inside your greenhouse, photosynthesis slows down, and your plants can be susceptible to disease.

Best Humidifiers for Greenhouses
Janco Greenhouses

Unless your plants are designed to withstand dry conditions you will need to buy a humidifier to maintain healthy levels. If your plants are designed to withstand dry conditions, consider a dehumidifier instead. Keep on reading to check out our top picks and learn about picking the right humidifier for your greenhouse. 

Reviews of the Best Humidifiers for Greenhouses

Product NameProduct PreviewBuy NowOur RatingCostMax Output LoadTemperature RangeProduct DimensionsCord Length
WILLHI WH1436ACheck Price8.9/10$$1100W (110V)-58 ~ 230 F
-50 ~ 110 C
4.9" x 3.6" x 1.8"3'
BN-Link Digital Cooling ThermostatCheck Price8.5/10$1000W (100V)40-108°F4.5" x 3.5" x 1.6"6'
Inkbird ITC-308Check Price9.0/10$$1100W (110V)-58~248 ° F
-50~120 °C
5.5" x 2.7" x 1.3"5'

Humidity refers to the amount of water vapor in the air, and some plants simply need more humidity because their root systems aren’t designed to hold enough water. Humidifiers measure the level of humidity and restore it to optimum levels, helping the plants thrive, so they’re more potent at fighting off infections and diseases. Check out our top picks. 

Evergreen Pet Supplies Reptile Humidifier

This is a compact ultrasonic humidifier designed to produce up to 300 ml of mist per hour. It features a 2-liter tank with a no-spill valve for easy filling.

If you’re buying a humidifier for the first time, this one will be the right one for you because it’s affordable and easy to assemble. Unlike other humidifiers, this one features a flexible hose that you can easily adjust to spray mist at specific areas. 

Due to its compact design, this is an excellent humidifier for a small greenhouse. You can control the output from light mist to dense fog, depending on your plants’ needs. Moreover, the humidifier automatically shuts off when it runs out of water for safety. However, you can only use distilled water with this humidifier, and it can become a little loud when you increase the output level. 

What We Like

  • Compact and affordable humidifier. 
  • Controllable mist output depending on your plants’ needs. 
  • Adjustable hose to spray mist. 
  • Automatically shuts off when the water runs out. 

What We Don’t Like

  • You can only use distilled water with this humidifier. 
  • Is a little loud. 

Ideal Air HGC700861 Industrial-Grade Humidifier

This humidifier is the best choice for a bigger greenhouse as it’s designed to cover an area up to 1610 square feet, maintaining healthy levels of humidity to help your plants grow. With a maximum output of 200 pints per day, this will be an excellent choice for dry weather. 

All you have to do is to connect this humidifier to the water supply, so you won’t have to worry about refilling it. The multi-directional head spreads the mist in multiple directions to maintain healthy growing conditions in the greenhouse. 

It also features a powerful motor that lasts for years of continuous use. However, this humidifier is more expensive and louder than other models. 

What We Like

  • Suitable for a bigger greenhouse. 
  • High level of output per day. 
  • Multi-directional head. 
  • Connects directly to the water supply. 

What We Don’t Like

  • More expensive than other models.
  • Loud operation. 

TaoTronics 4L Cool Mist Ultrasonic Humidifier

If you have a medium-sized greenhouse, you should consider this affordable humidifier because it can cover an area of up to 300 square feet. It features a 4-liter capacity and lasts all day with up to 30 hours of operation depending on the selected output level. 

Thanks to the LED display, you can read the current humidity levels and make the necessary adjustments to provide your plants with the optimum moisture. You can easily set the mist level into three different settings depending on the temperature. You can also adjust the timer to switch the humidifier off by activating the night mode. 

This humidifier will only release clean water, as it comes with a filter that traps microorganisms and bad odor. At the same time, it shuts off when the water runs out to protect the motor, and there’s a clear window that allows you to monitor the water level. 

You can choose this humidifier if the humidity levels don’t drop significantly in your greenhouse. Every time you restart the humidifier, you need to reset the humidity levels. 

What We Like

  • Affordable humidifier for small and medium-sized greenhouses. 
  • Long-lasting operation with adjustable mist level. 
  • Adjustable timer.
  • Built-in filter. 

What We Don’t Like

  • Doesn’t work in extremely dry conditions. 
  • The settings need to be reset every time you restart the humidifier. 

How to Choose the Best Humidifier for Greenhouse

How to Choose the Best Greenhouse Humidifier
Orchid care & Tips –

A greenhouse allows you to grow plants when the weather conditions aren’t optimum. Maintaining adequate humidity and moisture levels allows plants to better adapt to this controlled environment. Here are a few factors to help you choose the right humidifier for your greenhouse. 

Type of Humidifier

The most common type is the warm mist humidifier. It warms up the water, and the water evaporates and turns into water vapor, increasing the level of humidity. Evaporative humidifiers use airflow to create water vapor by drawing the water over a wicking material. 

Ultrasonic humidifiers use vibrations to increase the evaporation rate. The mist produced is of better quality. 

Temperature of Mist

Cold and hot mist don’t affect the health of the plants because the temperature difference won’t be noticeable. However, hot mist tends to be of better quality as the heat will purify the water. These humidifiers will also use more electricity. Cold mist humidifiers use less electricity and need less maintenance. 

Covered Area

A small humidifier will work if you have a small or medium-sized greenhouse. If you live in extremely dry conditions or have a big greenhouse, you should invest in a larger industrial-grade humidifier. 

Refill Type

Most humidifiers come with a tank that you can easily refill. However, if you have a big greenhouse that you need to run for longer hours, you should consider a humidifier that directly connects to the water supply. 

Run Time

A humidifier that runs for a long time will use more electricity. It also needs to be filled more often. The run time depends on how you adjust the mist output. 

Wrap Up

To control and maintain the humidity level in your greenhouse, you need to choose a reliable humidifier that adequately provides your plants with the needed humidity. We chose the Evergreen Pet Supplies Reptile Humidifier as the best choice for a medium-sized humidifier.

If you have a bigger greenhouse, you should consider the Ideal Air HGC700861 Industrial-Grade Humidifier as it has the power to cover a larger square footage.