Raise Humidity in Grow Room Without Humidifier

How to Raise Humidity in Grow Room Without Humidifier?

Today's Gardener (todaysgardener.com) is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. This site also participates in other affiliate programs and is compensated for referring traffic and business to them.

A humidifier is the best device to control your grow room humidity. It’s the only appliance that will give you the ability to control the humidity to the level that you would wish for your plants. We will share with you how it works at the end of this article.

But that doesn’t mean it’s the only way you can control the humidity of your grow room. In this article, we will discuss top ways to raise the humidity in Grow Room without a humidifier.

Here are simple ways to raise Humidity in Grow Room Without Humidifier.

1. Control the Temperatures

Temperature is the first thing we will focus with. It’s one of the major problems you will have to face in your grow room. This is simply because most of the conditions in your grow room have to be artificially controlled.

Unlike nature, you have to ensure that the temperatures in your grow tent don’t rise or go below the desired levels.

Now you could be wondering how temperatures are related to humidity.

It’s simple. Temperatures determine speed and rate of air movement in your grow tent. By now, you are aware that humidity is simply water vapor held in the air.

When air is hot, its particles vibrate and move faster. It loses its ability to hold more water vapor. As a result, the water vapor in the air evaporates easily and leaves the grow tent through the venting system.

High temperatures reduce humidity.

So, your focus should be to lower the temperatures. Cool air doesn’t vibrate and moves fast. It remains still – and this is how it can hold much water vapor.

There are different techniques you can apply to cool your Grow tent. They include; using cool lighting systems and installing venting systems.

Install Cool Lighting Systems

Lighting is a major contributor of excess heat into a Grow tent. Fluorescent lights specifically produce more heat as compared to other lighting bulbs.

Before you even attempt to use any other technique, deal with the source of heat. Remove any lighting system that is emitting excess heat to the Grow tent.

If possible, use LED bulbs.

LED bulbs are built in a way that 95% of their energy goes to the lighting while only 5% goes to heating. With them, you can expect minimal heating.

If you don’t have LED lighting systems in your Grow tent, check the following lighting systems. Buy the one that can fit over your grow tent and reduce its overheating.


  • Our top pick
  • Powerful cooling system
  • Different Wattages available (1000W, 2000W & 3000W)

King Plus LED Grow Light

  • Available in 600W, 1000W and 1200W
  • Energy-saving technology
  • Full-spectrum light
  • Comes with a bloom switch

Advanced Platinum Series

  • 300 watts
  • Perfect for a 4×4 coverage at 18” height
  • Superior 12-band full spectrum

Buy either of the above lights, depending on the size of your grow tent growing space. To learn how to determine the best light wattage read our article on How Many Watts Per Square Foot for Led Grow Lights You Need?How to Raise Humidity in Grow Room Without Humidifier

Work On Your Grow Tent Ventilations

Another reason why your Grow tent temperatures will rise it’s that there is no proper air circulation. When heat produced in the grow tent, it’s not pushed outside; it hurts the temperatures of your Grow tent.

One thing you have to agree is that air doesn’t move naturally in the grow tent as it happens in nature.

Here is where Grow tent fans and venting systems come in place. In short, get the air circulating and the temperature build-up will be lowered which will eventually lead to higher humidity.

Good ventilation would also ensure that the humidity inside the Grow area is uniform. You won’t have cases of over saturation of humidity in one area while other parts remain dry.

For effective venting, consider buying either of the following Grow tent fans from Amazon and place install them in your venting system. They will help you vent the Grow tent.

AC Infinity Cloudline S6 (Our Top Pick)

The fan is perfect for a mid-sized grow tent. It achieves an airflow of 351 CFM.

Key Features

  • Ideal strength for a mid-size room
  • Extremely quiet
  • The variable setting for efficient power consumption

TJERNLUND M-67 Inline Duct Booster Fan

The fan attains a power output of 460 CFM. This means it can run for a long time without changing its performance.

Key Features

  • Made with strong and high-end materials
  • Efficient blade design to blog a huge volume of air
  • Super quiet fan

Vortex 347 CFM S Line S-600 Fan 6”

With it, you will plant everything you would wish to plant in your tent or indoors.

Key Features

  • Mounts easily
  • Convenient with different speed controllers
  • A super quietest tent grow fan even at the highest speed

Hurricane Inline Fan

This makes it a perfect choice for anyone with a small grow area.

Key Features

  • Durable construction
  • Super Quiet Fan
  • Ease of installation

Terrabloom 10” Inline Duct Fan

It delivers a high airflow of up to 1065 CFM. At the same time, it’s cost-effective.

Key Features

  • Runs optimally for a longer period
  • Ultra-quiet fan
  • A powerful CFM coverage with a low energy consumption

2. Supply Enough Water

Humidity is basically water vapor held in the air. Another simple way to improve the humidity of your Grow room without a humidifier is by ensuring a continuous supply of water in your Grow area.

The following are simple ways to supply more water to your Grow tent.

  1. Ensure Your Plants Are Well Watered

Plants will take up water through the roots. When they are adequately watered, they will respire excess water through its stems and leaves. As more water is coming from the leaves and stems, it improves the humidity of your entire atmosphere.

This is a technique that will work well in a Grow tent with mature plants. They have developed roots that can absorb much water.

However, for plants in the early stages, avoid excess watering. The roots are not mature or developed enough to support the plant. Instead of operating well, it will turn out to be water clogged.

Either way, even for the mature plants, ensure that you exercise a little control. Don’t overwater the plant. Doing that will hurt them as well.

The idea here is always to ensure that your plants are adequately watered and are thriving.

  1. Have Water Points Inside The Grow Tent

Place clean water around the grow tent. As the temperature rises and wind from the fan pass over the water, it evaporates.

Put water in containers. Get heavy clothes like towels and sponges to soak water and hang them over the Grow tent. Place them in a way that wind from the fan is blowing over them.

It’s important to note that only clean water should be used in this case. Dirty water will create a conducive environment for Fungi and bacteria that would attack your plants.

Another safety measure is to ensure that you don’t place the water points near electrical appliances that can easily short circuit. If that happens, you will incur the cost of replacing them.

  • Use Spray Bottles

Water spray bottles will add a good amount of humidity to your Grow tents. All you need is to put clean water in them and spray in the air around your plants.

They will humidify your Grow room using the same concept as a humidifier. The difference is the fact that you have to manually press the head of the containers to release the mist.

Pressurized Sprayer Bottle is the best option for this task. Buy a container that will hold around 2 liters of water.

This is a perfect solution, especially for people with small tents.

  1. Use Battery Powered Sprayers

These are the same as the bottle sprayers. They all work with the same principle. The only difference is that one is manual, and the other is automatic.

The battery-powered sprayers spray water into the air automatically when they are turned on. Normally, they come with a bigger water container as compared to the manual sprayer.

All you need to do is buy the sprayer, put batteries, and mount it over your Grow tent.

  1. Buy Fogger

Instead of using sprayers that splashes water in your grow tent, you can use foggers. Commonly known as Atomizers, they deliver an ultra-low-volume mist. The mist coming from the fogger will be ready to mix with your hair and become humidity without the need of wind flow or excess heat.

Best foggers can contain between 2 and 3 gallons of water.

3. Mix Mature and Young Plants

Mature plants will help the younger plants by keeping the air humid. This is especially if they are well watered.

In a grow room, have some mature plants. They have developed roots that obtain much water. Also, they have developed and big stomata.

This is the main reason why they respire more than young plants. They will release more carbon dioxide and water molecules into the air. The young plants will benefit from those that have already developed.

However, when employing this technique, you need to ensure that you don’t overplant the mature crops. They will take much light and nutrients. If you overdo it, the young crops will struggle to thrive in the grow tent.

4. Combine Different Techniques to Get Optimum Humidity

We have already shared with you different techniques that you can use to keep your Grow tent well humidified. To get the best results to combine more than one technique.

Supply your Grow tent with water, cool the environment, and plant mature crops.

Find strategies that can be combined to give the best results. Even without incurring much cost of buying and installing a humidifier, you will have optimum humid in your Grow tent.

Understanding a Humidifier

It won’t be good to assume you already understand how humidifiers work. We also had mentioned that we would revisit and talk about it before we conclude this article.

A humidifier is an appliance designed to supply fog or mist. When used in the Grow room, they regulate the humidity of the Grow room environment.

Unlike other humidity control techniques, you can easily regulate the humidity level in a Grow area. When it’s high, you can lower it and when it goes low, you can raise it to the desired level.

As we already mentioned, humidifiers are the best in controlling relative humidity in a Grow room. We have already discussed all the other techniques that you can raise your humidity without a Humidifier.

But if you want the best results, consider buying a humidifier. If you don’t have the budget right now, you can apply the other techniques we discussed in this article.

And when you consider buying a humidifier, the following are the top humidifiers you can buy today from Amazon. Consider any of these humidifiers, and you will get the best when it comes to regulating the humidity of your area.

Click to each of these humidifiers to check their latest price on Amazon today.

Ultrasonic Humidifier

  • Release fog
  • Quiet for indoor operations
  • Ease of maintenance

Cool Mist Humidifier

  • Effective in warm weather
  • Ease of cleaning
  • Efficient performance

Parting Shot

A humidifier without a doubt is the best for controlling humidity in a grow room. However, it’s not the only effective technique you can use to raise your humidity. All the techniques discussed in this article are perfect options for a humidifier.