Regulating Humidity in a Cannabis Grow Facility

Regulating Humidity in a Cannabis Grow Facility

Regulating Humidity in a Cannabis Grow Facility

Professor DeBacco

Humidity
Humidity is the measure of water vapor in the air.
Many growers think this is unavoidable and while this is true to an extent, if humidity goes unregulated the plants could…
Be more likely to get powdery mildew or bud rot if levels are too high
Suffer from leaf burn/water stress if the levels are to low.

To Control Humidity You Need to Control the Environment
To gain better control over the growing environment growers need to isolate their room.
But air circulation is still important.
Sealing off and insulating the growing area is one way to get isolation from the outside environment.
This is important regardless of the outside conditions

Temperature Regulation Impacts Humidity
Temperature regulation is important for the plants in general, but how this is accomplished can impact the humidity levels.
For Air Conditioning units make sure the unit is sized appropriately to reduce the chance of large temperature swings from a unit that is either to large or small for the area.
The goal is to have your until run for consistent cycles for longer durations to moderate temperature changes.
Avoid short on and off cycles which will reduce the life expectancy of the unit and not be as beneficial for the plants.
Temperature and Humidity
Temperature and Humidity are inversely proportional.
When the temp. goes down… Humidity goes up
This is why swings in temperature impact humidity as well which will relate to potential disease pressure.
Goal is consistency.

Importance of Air Circulation
Oscillating fans are a good start, but in a room with a dense canopy floor fans may also need to be added.
The goal is to maintain consistency across all portions of a fully grown plant.

Cover Water Tanks and Check Drains
To limit the amount of water that may naturally enter a growing space be sure to cover any water reservoirs you may have.
Also, make sure the drains are actually draining excess water and it is not a large puddle on the floor.
Both may seem obvious, but still worth mentioning.

For Additional Help… Use a Dehumidifier
Dehumidifiers remove moisture from the air.
These units may be need more during the mid to late portions of the growing season because of the increase in plant matter.
Make sure it is a commercial grade (not a residential/homeowner) dehumidifiers
Residential models while cheaper, are also electrically inefficient, and can not hold up under the workload of a grow room
A proper dehumidifier will save money in the long run through proper humidity control and as a result reduce potential loss for disease.

Where Does the Humidity Come From?
Plants transpire about 97% of the water they absorb
Growers are suggested to have multiple units to properly regulate humidity
Multiple units offer more even control over a large grow space and also redundancy so if one unit fails the entire grow space does not fail with it.

To Increase Humidity
A humidifier can produce a constant flow of water vapor for an indoor garden which may be needed if the natural air is especially dry.
Cool water is used to create a mist that disperses throughout the space and increases moisture levels.

Avoid Competing Systems
Getting both the temperature and humidity in balance can be a difficult task.
However, knowing the natural condition of your outside air you may want to adjust light cycles to be during the natural night of the day to reduce the heat of the lights compounding the heat of the day.

Link to Lecture Slides: https://drive.google.com/file/d/1BXhYpUBI51nM5VLFb8XWGcQetH8i-YXC/view?usp=sharing

420 Magazine Source Content by Slide Title:
Temperature and Humidity
https://www.420magazine.com/community/attachments/vpd_2degree-gif.1651777/
Avoid Competing Systems
https://www.420magazine.com/community/gallery/dehu-humidifier-co2-jpg.1674329/

*Due to the description character limit the full work cited for “Regulating Humidity in a Cannabis Grow Facility” can be viewed at… https://drive.google.com/file/d/19eCnh9O1bVN0RtQkRulqSYAxXikZ5ESY/view?usp=sharing

14 Comments

  1. @samwest2675 on March 21, 2024 at 6:52 am

    Good stuff.



  2. @LAndre2874 on March 21, 2024 at 6:55 am

    Relative humidity is 34% temperature is 76 to 79 degrees steady. Could That low of humidity be the cause of slow growth?



  3. @overthenever4262 on March 21, 2024 at 7:01 am

    Spoken like a true believer !
    Thank you my friend .🌴 .
    Those 16 hour days are paying
    finally 🌴🤠🌴



  4. @niknik7470 on March 21, 2024 at 7:03 am

    Can you do a video on plants that you’ve grown personally? Can’t wait for the next upload 👍



  5. @paulg3012 on March 21, 2024 at 7:10 am

    Do people seal rooms and just air condition and dehumidify or do they still intake and exhaust air, bringing in moisture and blowing cool de-humidified air? A sealed system would be more efficient but wouldn’t carbon dioxide run low? Air conditioning and dehumidifying a room containing a smaller grow space would allow temps and humidity to drop but would be terribly inefficient and expensive exhausting air constantly. Cold is not an problem in my country.



  6. @freedom_born on March 21, 2024 at 7:10 am

    Man Prof. Absolutely excellent information as always. As Always. Please don’t stop uploading. I’m just hoping Chris from MrGrowIt reaches out real soon. His viewers are missing out big time.
    However for humidity – and relative temp lowering during flower – I’ll use frozen water bottles. Admittedly they’ll only be effective enough for smaller spaces like a 2×2, since you won’t be replacing as often compared to 2×4 or larger (for which you’d essentially need something more efficient).
    Nonetheless, don’t cheap out like me, unless you’re comfortable & confident with your knowledge.



  7. @realneighborhoodP on March 21, 2024 at 7:19 am

    Hello, Professor:

    Thanks so much for all of this knowledge. It’s helped me a ton!

    I do have one question I can’t find any solid answer to — perhaps you could help?

    I get that if one raises the temperature of a grow space then the humidity will fall. What happens, then, if the humidity itself is raised in a tent — will the temperature go down?



  8. @stewiepid4385 on March 21, 2024 at 7:23 am

    So, being a poor man but inspired by this channel, I asked myself, "What would this channel recommend to regulate constant high humidity in my grow space?" Here is the answer I heard in my head: " Line your walls with Silica bags using a stapler. "
    Problem solved! Relative Humidity is 0.2%. Lol! I love this channel!



  9. @Marcus441955 on March 21, 2024 at 7:24 am

    Have 3 plants in vegetative. 2x4x60 grow tent with exhaust fan, a clip on fan and vents. Beginning to get humid here on Long Island, NY and thinking of using a passive dehumidify system like damp rid, or silica. Inside RH moves from 63.3% to 78 with a few spikes into the 80’s, and presumably will rise as the summer comes in. Temperature is ranging 72.1 to 80. Plants look healthy, good color, multiple cola sights, no sign of distress. First timer and trying to anticipate, but budget limits choices. Any advice is appreciated.



  10. @michealsvientek4771 on March 21, 2024 at 7:31 am

    Thank you for Your wisdom and knowledge



  11. @jamesbobby2751 on March 21, 2024 at 7:32 am

    Dehumidifier raise the heat ?



  12. @muthrfuqrjonz3530 on March 21, 2024 at 7:39 am

    Thank you for fine tuning my skills and increasing my knowledge on so many things.



  13. @dr.trichome6419 on March 21, 2024 at 7:40 am

    Very important to monitor humidity 👨‍🔬🤙



  14. @charmcitymaryland3768 on March 21, 2024 at 7:41 am

    I’m in the flowering stage. I have two monitors in the grow room and the temperature stays around 75-78 degrees. Humidity around 84%. I put a commercial humidifier in the grow room. Now the temperature rose to 88 degrees but the humidity level is down to 50%. How can I balance the two to keep a medium temperature around 75 degrees and humidity around 50% throughout then flowering stage