How to control the humidity indoors

The most important tips for controlling humidity when growing indoors.

Controlling the humidity is one of the most important things in cannabis cultivation. Many growers make mistakes, especially in this area, resulting in various problems, some of them serious. The biggest mistake made when controlling humidity is that many growers and beginners initially think that it is not necessary to invest in this area and therefore initially do without the necessary equipment. Only when more serious problems such as mildew or root rot occur is the matter taken more seriously.

There are a few things you can do to control the humidity in the grow room and get it to an optimal level.

1. control of the temperature

Temperature plays an important role in cannabis cultivation. Some of the plant lights give off a lot of heat, which has to be transported out of the grow room. In the best case, the temperature in the grow room should be constant. Both an overdimensioned and an underdimensioned ventilation system lead to problems that become noticeable in the plants. If the ventilation system is oversized, the temperature will fluctuate too much and it will be almost impossible to keep it constant. If the aeration system is undersized, the temperature will become too high over time.

An optimal setting and adjustment in the range is an important factor to control the humidity in your grow room.

Humidity is relative to temperature. This means that when the temperature goes down, the humidity goes up. Too low a temperature can therefore be responsible for fungal diseases and mildew spreading.

2. close the grow room well

When it comes to creating a stable growing environment, which in turn allows for humidity control, it is crucial to seal the grow room tightly all around. All gaps and cracks in the grow room, on the floor and on the sides must be well sealed. You can use sealing tape, silicone, insulating foam or a grow tent, which is naturally sealed all around as soon as you close the zip. The zipper of a grow box should therefore always be closed when you have nothing to do inside.

External weather influences should be kept out of the grow box. These influences could negatively affect the temperature and other factors.

3. air movement - you can't do without it

Humid air is lighter than the other air in the grow room, so it goes up. Co2, on the other hand, settles more at the bottom of the grow room. Air movement and the supply of fresh air is an extremely important point if you want to grow healthy plants and achieve great harvests. The best thing is to have air circulation from the floor, from the sides and from above. There should always be enough fresh and new air entering the grow room. If there is sufficient air circulation, harmful fungi and insects are also less likely to spread. Make sure that the strong airflow of a fan is not directly and constantly directed at a plant. Cannabis plants do not like this.

4. watch out for standing water

Standing water that has formed during watering and collects all around the bottom of the planter should be removed immediately. Any water container and standing water should be removed from the grow room or covered with a lid so that it cannot affect the humidity.

Accordingly, nutrient tanks must also always be closed because otherwise they constantly release moisture into the air.

5. Use a suitable fan

Use a tube fan, ufo fan etc. that is sufficient and suitable for your grow room and a matching activated carbon filter. A fan ensures that the stale, hot air and humidity is transported out of the grow room and new fresh air can flow in. It is one of the indispensable things you need for your indoor grow to achieve good results. If the grow room is larger or you want to optimise the fresh air supply, you can use a small axial fan for the supply air.

6. use a dehumidifier

Dehumidifiers can help remove excess humidity from the grow room. It is important that the dehumidifier is large enough and has sufficient capacity.

Humidity control is essential for plants but also crucial for the life of many devices. If the humidity is too high, electronic devices can be damaged and wear out more quickly.