How much air conditioning is safe to have in a grow room or tent?

Published Aug 18, 2019 01:00 p.m. ET

If you have a history of growing cannabis outside, then chances are, you might be nervous about attempting to move your precious grow indoors. It’s easy to let nature work her magic while you sit back and add only the boosting elements, but to bring everything inside can be a whole lot of work. When growing cannabis outside, some of the beautiful aspects of nature are helpful like gentle breezes, rain and UV rays, but others are not always so kind.

Hail, harsh wind speeds, pests and predators, present a risk when growing cannabis outside. So perhaps it’s safer to bring them into the comfort of your abode. Seems easy right? Not so fast! Nothing good ever comes quite so easy. The average home comes with its own challenges to look out for. Our homes are typically heated with electricity or gas, both of which can be terrible for drying the air. Since marijuana plants are a tropical species that are accustomed to humid conditions, this isn’t great, but that’s not even the biggest feat you will have to manage.

In the colder months, we heat our homes, but in hotter weather, we do the opposite. Oftentimes high-powered central air or window units that forcibly pump tons of cold air directly into the house. This helps to keep us cool and is considered to be a major advancement for humankind, but none of this helps these tropical heat and humidity loving plants at all. In fact, the influx of super cooled air can often be enough to stunt or kill cannabis plants.

Is air conditioning safe to have for growing cannabis indoors?

Yes, and no. Though you can most definitely keep the average temperatures bearable without affecting the growth, there is no way to dip too far below 25 without causing at least some damage. Even if you do set the thermostat on low, you have to be sure to keep the growing cannabis plants far away from the vents that might blow directly onto their leaves, as this chill, can be enough to stunt the growth of your marijuana plants, while making them more prone to conditions like root rot.

Is growing cannabis outside the only safe way?

Most definitely not, as there are so many variants on either side that it is nearly impossible to say which one is safer. However, there are a few things that can be done to ensure the marijuana plants get all the love, heat and care that they need.

1. Never set the thermostat lower than 25°C. Though technically a hardy cannabis plant should be able to protect itself from minor temperature fluctuations, most older houses are not efficient, which results in each room being a different temperature than the next, often leaving the least used section of the home cold. Unused portions are the same ones that at first might appear to make the perfect grow room, and this combination never ends well.

2. If the air conditioner is usually maintained at a low temperature, then you might want to invest in a heater, and block the room off that your plant will be residing in, to hold the warmth.

3. Always pay attention to humidity levels in your grow room. Cannabis plants like environment that is warm, moist and humid, and maintaining this can help to increase the size and the potency of your yield. Typically, between 30% and 40% is considered to be safe for fruitful range for cannabis plants.

4. Never grow marijuana directly in front of an air conditioner, no matter the temperature. Though it might not feel terribly cold to you, a cannabis plant rests in soil, and a steady breeze that is too much can reduce the strength of both the plant and its root system.

5. Consider investing in a grow box, cabinet or tent. A grow cabinet these days will come equipped with everything that you could ever need to keep cannabis plants thriving with a touch of a button, including lighting, humidity settings, heat settings and most even have a small built-in fan to maintain stem strength. This can be especially helpful if you are only starting seedlings that will eventually shift to growing cannabis outdoors.


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