‘Grow Room Controllers’: Managing Humidity, Temperature, and Everything Else You Need to Grow!

Grow Room Controllers: Regulating the Humidity and Temperature Conditions of Your Grow Room

For all ganja growers, controlling the climate inside of your room is an essential undertaking. If you ever plan to produce your own bud, you must take extra-special care when it comes to the conditions inside of your grow operation – and that’s at all times.

If you’re growing, you need grow room controllers… well, that is, unless you somehow don’t want your crops to return all your time, effort and hard work back to you tenfold, with bountiful yields…

This fact of climate control applies especially in the case of many Australians, who experience harsh temperature and humidity conditions as a daily fact of life.

Regardless of whether you’re in the early phases of cloning, or the later stages of flowering – you should be paying close attention to temperature and humidity levels, from start to finish. You should also be doing your best to maintain appropriate climate controls, based on your crop’s phase of development.

The thing about indoor climate control, is that it’s much easier said than done – it’s not a task to take lightly. Using the right tools and equipment, you can help yourself to get there. Don’t go ‘guns blazing’, though; it’s important to research your genetics – and understand what your plants’ particular needs are – for optimum results.

The Basics of Temperature Control

Funnily enough, cannabis plants and humans share very similar temperature preferences. As such, figuring out your grow room temperature isn’t all too difficult.

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Not too hot, not too cold.

If you’re forming beads of sweat, feeling uncomfortable or perhaps even chilly – chances are, your plants are feeling it, too.

…It’s not quite that simple, though. For one, the ideal temperature range changes as your plants age and develop.

Young plants prefer things to be slightly warmer – they can thrive anywhere between 70 and 85°F. As your plants mature, however, you’ll want to drop the temperature slightly – but not below 65°F.

Temperature Control – 5 Important Variables

  1. Ventilation and circulation are crucial: Always remember that vents are your friends. Heat can become a major problem; especially if you’re using HPS or CMH lights, instead of cooler LEDs. It’s important that you vent hot air out and introduce fresh, cool air into the room; even as much as every few minutes.
  2. You may need to install an A/C: If exhausting hot air out of the grow room isn’t enough to keep temperatures down, an A/C or evaporative cooler might be necessary.
  3. Ideal temperature is dependent on genetics: Turns out, certain strains are more resistant to heat and cold than others. If you’re using high-intensity lights that give off a lot of heat, it’s a good idea to choose heat-resistant strains.
  4. Be smart about your light schedule: Since things generally run cooler at night, most Australian growers run their lights overnight; keeping the plants in the dark during the day. This light schedule might even save you money since electricity generally costs less at night.
  5. Fans aren’t enough: We already talked about the importance of venting and circulation. Just remember… fans won’t help with temperature issues. Fans are a necessary addition, since they help with circulating air; but you’ll also need an exhaust and air intake to maintain temperature.

The Basics of Humidity Control

grow room controllers

Aussie cannabis and hemp growers generally find their grow room’s humidity levels to be exceptionally difficult to regulate; even moreso than temperature.

To make matters worse for these poor growers… there are drastic changes between ideal humidity levels, as plants mature from seedling to harvest.

Failing to control humidity can simply wreak havoc on your crop. A grow room which is too dry will result in dry plants, which cannot draw moisture from the air to maintain their health.

On the other hand… a grow room that is too humid will create mold, mildew, and root rot. Humidity problems can additionally contribute to nutrient deficiencies, and slow down overall growth and development. In other words, not good news for your grow setup.

Ideal Humidity Ranges*

Cloning/Seedling: 70% Humidity
Vegetative Stage: 40-60% Humidity
Early/Mid Flowering: 40-50% Humidity
Late Flower: 40-45% Humidity

(*based on approximations in grow phases).

Cannabis plants prefer high humidity levels when they’re young; once they mature, you ought to gradually reduce the humidity in your grow room. Once the plants are being harvested, you should bring the humidity back up slightly – to about 50%.

For accurate humidity readings, you’ll need a tool called a hygrometer. From there, you’ll know whether it’s too humid or too dry; and you’ll be able to make a game plan by adding either a humidifier or dehumidifier. If you’re using a powerful AC you will need a humidifier. Air conditioners tend to ‘dry out’ rooms.

FAB’s Final Recommendation:

Usingtemperature and humidity controllers for all of your indoor growing endeavours is, without a question, the best possible thing you can do to maintain an ideal grow room climate – but with that said, a controller will only get you so far.
You’ll also need equipment like AC units, heaters, humidifiers and dehumidifiers, to maximise your ability to regulate the temperature and humidity conditions of your grow room. Be safe out there!

Also: be sure to check out our growing seriesfor more tips, tricks and insights!


Author: Mitch

Mitch Keys is a young writer from Brisbane, Australia unfolding in a dynamic process of becoming (like everyone else, so don’t go thinking he’s special or anything). He likes being alive.

Mitch Keys is a young writer from Brisbane, Australia unfolding in a dynamic process of becoming (like everyone else, so don’t go thinking he’s special or anything). He likes being alive.
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