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What temperatures should I maintain in my grow room?

The ideal air temperatures within the grow room are between 24°C - 28°C during the light hours. Try not to exceed 32°C during this light period and do not go below 18°C as a minimum for the dark period.

It is important to let the temperature be higher during the light period and cooler during the dark.
Also your nutrient solution should be kept warm in winter.

What happens if grow room temperatures are sometimes too high or low?

As long as it doesn't happen regularly then no harm should be done.

Usually, if the plants are consistently too hot or cold then aside from disease related problems, there will be a reduction in yield. The longer the plant is at the wrong temperature the greater the loss of production.

What humidity should I maintain in my grow room or tent?

The ideal is 50% in the plant canopy, any higher and your plants run the risk of diseases such as grey mould.

If the humidity is considerably higher than the outside humidity then you probably haven't got enough ventilation. To measure humidity you can use a small electronic weather station or hygrometer.

How much ventilation do I need in my grow room or tent?

The right amount of ventilation will vary for every situation; however there are some guidelines you can follow.

The ventilation should be sufficient in capacity to keep the room temperature no higher than the outside temperature and the humidity at 50%.

Too much ventilation may cause humidity or temperature to be too low; too little ventilation and the humidity and temperature may rise to unacceptable levels.

It is important that you also avoid a laminar flow in your grow room or tent. This is where the air is dragged or blown in one hole and sucked or blown straight out another without passing through the plants. This results in a streamlined airflow which does little.

The air should pass through the plant canopy to the extent that you can see the leaves moving as they would in a gentle breeze. An oscillating fan inside the grow room will help with this.