Humidity & Temperature Control

Humidity & Temperature Control


Controlling your temperature and humidity levels in your grow space is a very important aspect of indoor cannabis growing. Whether you have already set up your grow space or are still in the planning stages, you should consider investing in the proper tools that will ensure your plants are at their optimum health. In this guide we will go over all the aspects of controlling your temperature and humidity as well as discuss a few products that can benefit you as a grower.


Optimal Conditions for Optimal Cannabis

To successfully cultivate cannabis indoors, you will need to know the best growing conditions for the plant. While it’s true that every strain has slightly different needs, the overall environmental requirements are more or less the same. Below we will take a more in depth look at the exact temperature and humidity levels that cannabis tends to thrive at.


The ideal temperature range for cannabis is generally between 68 and 77°F (20 and 25°C). As your grow space makes the transition between ‘day’ and ‘night’, try not to let there be more than an 18 degree difference between the two temperatures. Some growers prefer temperatures higher than the recommended range as it generally stimulates the cannabis to grow faster. However, this can stress the plants and also requires increased levels of watering and potentially more added nutrients. Oftentimes it is recommended as a general rule of thumb to keep the temperature towards the higher end of the range while the cannabis is vegetating. Then once the plants move to their flowering stage, lower the temperature to the cooler end of the range.


Humidity, often referred to as relative humidity, is the percentage of moisture in the air. For the most part, cannabis tends to prefer the humidity level somewhere between 40 and 70 percent. Similar to temperature, vegetating cannabis likes the higher end of the humidity range and flowering cannabis prefers the lower end.


For example, sprouting seeds and seedlings prefer upwards of 70 percent humidity. This allows their root system to have ample access to nutrients in the grow medium and encourages the plant to grow stronger. As the plants fully enter the vegetative stage you can decrease the humidity level slightly.


Gradually lower the level until the cannabis reaches its flowering stage. At this point, the humidity should be somewhere between 40 and 50 percent. As you get ready to harvest the buds, you can drop the humidity even lower to somewhere between 30 and 40 percent. Remember, do not go lower than 30 percent humidity as this can cause your plants to go dormant.

Carbon Dioxide

Another important aspect in your environment for your cannabis is the CO2 or carbon dioxide levels. This is more or less controlled by the amount of fresh air available to your plants. By using a simple accessory like a fan, the air will be circulated enough that your plants have ample CO2 access. Thankfully there are tools that measure CO2 levels in addition to other factors like humidity and temperature that can make your life easer.

How to Control Temperature and Humidity in Your Grow Space

Depending on the size of your grow space, it may change the way you will control the temperature and humidity levels. For example, a well insulated room as well as a good quality grow tent will both maintain optimum temperature and humidity levels easier. Also, depending on the equipment you already have in your setup, your needs may change.


For examples, lights like HIDs consume high amounts of electricity and put off large amounts of heat. This can cause temperature to spike so you would need fans to ventilate and make sure the temperature doesn’t go too high. On the other hand, if you use LED lights which put off little to no heat and your space has thin or zero insulation, you may need to use something to heat the space instead. All of these factors can determine your exact humidity and temperature needs. Below you can find information on basic tools and accessories to make monitoring both environmental factors easier as well as information on individual products to meet your unique growing needs.


How to Choose the Best Tools for Your Setup

When it comes to choosing the best tools for your cannabis growing needs, there are several factors to take into consideration. First, you should take a look at how many plants you currently have as well as think about how many you eventually want. This can factor into the size of some of your equipment as well as perhaps buying equipment that syncs well with other components if you need to expand.


You’ll also want to make sure your grow space is as cost effective as possible. This means choosing more energy efficient lights like LEDs over HIDs. While sometimes this means a larger initial investment, you’re really saving yourself money in the long run. Investing in all of the equipment to make your setup and grow space perfect for your cannabis plants will benefit you greatly as a grower.


Also make sure you know whether or not your cultivation of cannabis is legal in your state or area. If it’s not, you’ll need to take necessary precautions in equipment like monitoring your electricity consumption and making sure the space is well-ventilated. In some cases, a carbon filter to eliminate the cannabis odor can be a great investment. An ionizer can also be used to neutralize the odor immediately should the need arise.

Tools to Measure Humidity and Temperature

At the very least, you will want a hygrometer and thermometer. In many cases, you can find a tool that performs both functions. These are usually referred to as thermo-hygrometers. It’s always advisable to treat these tools as investments that will help your production and/or business in the long run. For this reason, you should buy the best quality products that are within your budget so you don’t end up having to purchase new supplies two or three years down the road.


Here are a couple of great thermo-hygrometers that are sure to meet your needs.

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