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What To Do When Your Marijuana Grow Room Gets Hot


What to do when you’re marijuana grow room is very humid? The grow space will naturally be humid because the marijuana plants emanate moisture that collects in the garden space. To get rid of that moisture, the easiest thing you can do is ventilate the room and replace the moisture with drier air.

For gardens that are closed systems, a dehumidifier must be used. Dehumidifiers have cold tubing that will condense the moisture in the air and make it less humid. Of course, they do release heat and can make the grow space too hot if you’re not careful. To avoid overheating, just affix some air vent tubing to the dehumidifier’s exhaust so that the heat is pointed outside the grow space.

If the room is both hot and humid, an air conditioner could work toward removing the moisture while cooling the garden. Download my free marijuana grow bible and learn more about growing marijuana.

What to do when your marijuana room is too hot? There are plenty of ways to cool down an overheated grow room. See what suits you best:

-It can be ventilated to remove the heat.

-An air conditioner can replace the hot air with cool air.

-Prior to flowering, an air cooler that evaporates water to lower the temperature can be beneficial. These coolers won’t add too much moisture to the air and are ideal and extremely efficient during vegetative growth. They are, however, not good for plants in the flowering stage because they create too much moisture.

-If the temperature drops drastically at night, you could solve the heat issues by running the garden’s lights at night instead of the day.

-Hydroponically-grown plants can shift temperatures based on how hot or cold the water is. You can keep the plants cool even if it’s technically hot outside. If the room temperature is somewhere in the 80’s (27-30*C), try to keep the water temperature in the 60’s (15-20*C). Growers can install aquarium water coolers to keep the water cool automatically.

-Any heat producing equipment should be taken out of the grow room is at all possible (e.g. light ballasts and large pumps).

-Avoiding heat starts from the beginning. Take preventative measures to ensure that heat will not be an issue with your crop. Air- or water-cooled lights keep the lamp’s heat from entering the garden. A series of tubes takes the heat from the lamps to the outside without affecting the temperature in the grow room itself. A great way to keep a grow room from overheating is by using LED grow lights. You can find out more about LED grow lights by clicking on the banner below:


All top quality marijuana seeds are available in my marijuana seed shop. We ship seeds to the US, CA and many other countries. For any growing related question please visit the marijuana support page. Make sure to download my free grow guide.

Source: ILoveGrowingMarijuana.Com


About Author

Robert Bergman is a master marijuana grower. Robert Bergman is the author of 'Marijuana Plant Care' and 'The Marijuana Grow Bible'.


  1. Check out a Surna water chilled cool system (www.surna.com) we’ve been using our for years. They are one of the few companies in hvac that know anything about climate control in a cannabis grow.

  2. Kelp and/or other seaweed teas and soil additions will also naturally help Cannabis and other plants to be more resistant to heat stress and damage. This does make sense considering that seaweed has evolved to be accustomed to very wide ranges of temperature fluctuations it endures. It’s a must have in my organic / vegan / kosher soil mix.

  3. Humboldt Star on

    Build the humidifier into a external wall so the heat it produces exits the room, if you use a vent use a low power inline fan to remove the heat from it, you can get a cheap one at home depot. Point the venting duct vertical and let it exit high, since warm air naturally rises. In the winter or colder regions you can pull cool air from a basement area.

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