Climate Control Grow Tent (How To Control Cannabis Grow Room Climate)

Should you be able to successfully control the climate in your grow tent then you can almost guarantee a decent yield.

Climate Control Grow Tent (How To Control Cannabis Grow Room Climate)

Other factors come into play yet having a good grasp on how to create, and then maintain, the optimal conditions for cannabis growing is crucial. While it is essential for the yield, there are also strict restrictions if you want to grow your cannabis commercially.

That includes GAP and GMP certifications so you will want to look out for the climate.

In this guide, we will detail the climate control in a grow tent.

This will include how to control the climate in a grow tent including the heat and humidity. We will also detail what the best climate for a grow tent is and what the temperature should be.

How Do You Control The Climate In A Grow Tent?

Controlling the climate in a grow tent can mean taking care of several factors all at the same time.

While the heat and humidity are crucial aspects (more on those later), the lighting, airflow, and CO² (carbon dioxide) are important to consider too.

These are all considered environmental aspects that hold the key for controlling the climate in your grow tent.

Cannabis plants depend on light to help determine when they are ready to begin flowering and that can also mean a long time in darkness too.

Consider blackout screens to keep the light out and LED lighting to control the amount and frequency of light that your cannabis plants are exposed to.

Look out for the specific cannabis strain too as it could determine your thinking on the lighting. In general, cannabis plants enjoy long days and shorter nights, particularly during the vegetative stage. 

How To Control The Heat And Humidity In A Grow Tent 

The lighting will also have an effect on the heat and humidity in the grow tent. Even modern LEDs will have to constantly radiate heat and that all adds up.

In theory, your indoor grow tent should be warmer than a greenhouse that is subjected to natural sunlight. That heat will increase how each cannabis plant perspires which will then impact on humidity. 

Use several temperatures to get a good idea of the temperature at different times of the day.

You can then use an HVAC system, a heat pump, air conditioners, or heating pumps to bring in cold air or water, or heated air or water when you need it. 

There should be a decision made between whether to go for HVAC or dehumidification.

The surefire method is using a dehumidifier which uses a heat exchanger. This condenses the water inside the unit and effectively takes out the water from the air. 

If removing the water from the air sounds a little too simple then you may want to opt for HVAC. While it will impact the humidity, HVAC is the ideal system for temperature control so it should remove water vapor but not in the most efficient way.

An HVAC system would also have to be run continuously and it may mean switching between cooling and heating to get the ideal climate.

What The Best Climate Is For A Grow Tent 

Once you have worked out how each environmental aspect affects your grow tent, you can attempt to hit the best climate. That should mean a relative humidity level of between 40 and 70%.

Climate Control Grow Tent (How To Control Cannabis Grow Room Climate) (2)

The vapor pressure deficit has an ideal range between 0.8 and 1.1 kPa (kilopascal though this can be measured in pounds for every square inch as psi) during the growth stage.

As the cannabis plant enters the flowering stage, the kPa needs to be upped to between 1.0 and 1.5 kPa.  

The humidity also has a role to play with the problem of mold and mildew, specifically powdery mildew and bud rot.

This is particularly important as the best climate, and your cannabis plants, can be ruined by mildews and fungal diseases. As long as you can limit your humidity levels successfully, this issue should not develop or become a problem.  

At What Temperature Should My Grow Tent Be?

The ideal temperature range for your cannabis grow tent should be between 65 and 80°F. Within that temperature range, you should be able to maximize your yield and develop the plants to create healthy, large buds.

Of course, the temperature will then be affected by other aspects of your environmental control including the lighting and humidity.

These aspects all work in tandem so try to consider how changing the temperature will affect the humidity and vice versa. 

Final Thoughts

Like any plant cultivation, controlling the climate in your grow tent is ideal for your cannabis plant. That means some important decisions on how to affect the humidity and temperature when you need to.

Look at limiting or increasing the airflow when you need to as well as these factors all work in tandem. 

Frequently Asked Questions

How Do You Use Airflow To Improve Cannabis Plant Cultivation?

To make sure that your cannabis plants have the ideal temperature and humidity to thrive, you should look to controlling the airflow.

The movement of air is crucial when you consider how crowded a grow tent can become with several canopies, many of which overlap.

Cannabis buds are also very dense and airflow will help dispel those humidity pockets, better known as microclimates. If you can mitigate those uneven conditions using airflow then you can improve cannabis plant cultivation.

How Does Co² Improve Cannabis Growth?

For photosynthesis, CO² is incredibly important. With the right sunlight and plenty of water, by upping the concentration of CO², you can improve cannabis growth.

The ideal concentration is around 400 parts per million though you can inject compressed CO² too to get it up as far as 1,000 parts per million.

Zack Finch
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