Grow Room Temperature Controller-Marijuana Growing Temperature

Temperature is an aspect that can make or break any cannabis grower. Just like most plants, you have to make sure that your growing environment is neither too hot nor too cold. It may be hard to control the temperatures if you are planting your marijuana outdoors. However, an indoor environment is much favorable and more comfortable to monitor. There is an ideal climate, that is, temperature, level of humidity, and amount of carbon dioxide that best suits the growth of cannabis. If you want to get the best results from your marijuana farm, you need to ensure that the temperature in your grow room range between 65 to 85 degrees Fahrenheit. The relative humidity should range between 45% and 85% together with a carbon dioxide level of 1000 ppm to 1200 ppm.

grow room temperature controller

There are numerous conditions, both indoor and outdoor, that may affect the temperature levels in your grow room. During the summer, the temperatures in your grow room may skyrocket exponentially. The winter season as well can make it harder to provide the right amount of heat for your plants to thrive. Outdoor temperatures can also lead to a drop in the internal temperatures within a short period. These changes in temperature can affect how your cannabis plants respond to nutrients, the amount of moisture in the grow room, and to specific points, the viability of your plants. Therefore, you need to always be in control of the temperature in your grow room. But how do you do so? Before knowing how to control the level heat in your grow room, it is essential first to understand what happens when the heat levels in your growing environment are low and high.

What are the effects of high temperatures in a grow tent?

freezing-vs-hot-temperatures-cannabis-grow-room

It is quite simple to tell if plants are overheating. You will notice signs such as leaves and stems curling with some burnt patches. One major problem facing plants that are exposed to too much heat is stunted growth. The time it takes your plants to grow increases. If the heat level is high during the vegetative stage, then, your plants may develop longer than regular stems. When the temperatures exceed 75 degrees during the flowering stage, the potency, taste, and smell of your cannabis will be affected for good. If the heat is due to the grow light in use, the buds will get bleached and stressed out since they are closest to the source of light. The leaves of your plants may start to discolor and curl. The effects of heat will be more predominant on the plants that do not receive enough water. Due to an increase in water transpiration, marijuana may experience a nutrient burn. High heat may increase the levels of humidity in the grow room, thereby leading to the development of mildew.

What are the effects of low temperature in a grow tent?

When the temperature in a grow room drops below 55 – 60 degrees Fahrenheit, the growth of your marijuana will slow down, and the plants may eventually die. If the temperatures drop during the flowering stage, your overall harvest will be in jeopardy. If you have an outdoor farm, your marijuana plants can adapt to night temperature that is as low as 50 degrees Fahrenheit. The effects on the plants due to the low temperature will not be long term. However, you still need to be aware of the temperature around your plants. Any temperature decline below 40 degrees Fahrenheit is a danger to your plants.

What is the ideal temperature in a marijuana plant?

ideal temperature in a marijuana plant

Every stage of growth in a marijuana plant has its ideal temperature. During the seed germination phase, marijuana seedlings and clones require a lot of humidity for them to get water since their roots are not yet developed. During this stage, it is best to use a humidity dome so that you can quickly get the right conditions for plant growth. During this stage, you should maintain your grow room temperature to between 68 – 77 degrees Fahrenheit to as well get the high levels of humidity. The plants can develop the roots with time. The vegetative phase requires a temperature ranging between 70 to 85 degrees while maintaining high humidity. At night, you should keep a low temperature, but not lower than 59 degrees Fahrenheit. However, the more the plant matures, the more it can withstand any change in temperature.

Once your plants get to the flowering stage, they can thrive very well under room temperature. You should ensure that the temperature does not exceed 82 degrees Fahrenheit. When you increase the temperature past 82 degrees, the terpenes will evaporate, reducing the potency of the marijuana. The buds will also experience stunted growth. Keep the temperatures lower than during the vegetative phase, especially during the 6th and 7th week. The production of terpenes is at its max during this period. If you expose the buds to a high temperature then, you risk evaporating them. Terpenes are the elements responsible for the smell and taste of cannabis. To get the best out of the terpenes production, ensure that the temperature alternate between a room temperature daytime and a more chill night time.

The last phase in the growth of cannabis involves harvesting. During harvesting, you have to dry and cure your marijuana. Once you ensure that you have the right temperature and humidity level, you can be sure to grow the best cannabis.

It is never easy to manage the ideal temperature for a grow room when you start working in a new environment. The restricted airflow in a grow tent especially can make the process even harder. Here is a simple guide that can help you maintain the right temperature through all the growing phases of marijuana.

Best Equipment About Climate Control For Grow Cannabis Indoor 08- 2022

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DIGITEN DHTC-1011 Temperature and Humidity Controller Outlet Plug in Thermostat Humidistat Reptile Humidity Controller Greenhouse Thermostat Heating Cooling Humidifier Dehumidifier
278 Reviews on Amazon
DIGITEN DHTC-1011 Temperature and Humidity Controller Outlet Plug in Thermostat Humidistat Reptile Humidity Controller Greenhouse Thermostat Heating Cooling Humidifier Dehumidifier
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Inkbird Temperature and Humidity Controller ITC-608T Pre-Wired Dual Stage Thermostat 120VAC 15A 1800W ETL Listed Mushroom Greenhouse Homebrew
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Inkbird ITC-308 Temperature Controller with IHC-200 Humidity Controller
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Inkbird ITC-308 Temperature Controller with IHC-200 Humidity Controller
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Getting to know your lighting system

One of the biggest factors influencing your grow room temperature is the lighting system you are using. Every time you struggle with heat in your grow tent, the type of lighting system you use should be the first thing that you check. Depending on the lighting system you use, each one affects the room temperature uniquely.

High-pressure sodium and Metal Halides

High-pressure Sodium and Metal Halide are known to produce marijuana with the best yield, taste, and look. However, they generate a lot of heat. If you use metal/ sodium halide bulbs, you will need to know of different ways you can use to get rid of the temperature the bulbs emit.

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VIVOSUN Hydroponic 600 Watt HPS Grow Light Air Cooled Reflector Kit - Easy to Set up, High Stability & Compatibility (Enhanced Version)
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Mini Sunburst SBMM150S High Intensity Sodium Lighting System with 150W HPS Lamp
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Sun System HPS 150 Grow Light - Grow Vegetables, Herbs, and Flowers Indoors, 16,000 Lumens
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Ceramic metal halides

Ceramic Metal Halide bulbs are one of the best bulbs you can use. They give a light output that is 60 to 70 percent the amount of power they consume, thereby producing only a small amount of heat.

LED bulbs

LED grow lights bulbs are a favorite to cannabis farmers due to their ability to reduce the heat in the grow tent by 40 percent compare to an HID bulb that uses the same amount of power. In a grow room, you have to position an LED light slightly from the canopy of the plants to protect the plants from burning. LEDs are known to provide the most light for the least amount of energy.

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GooingTop LED Grow Light,6000K Full Spectrum Clip Plant Growing Lamp with White Red LEDs for Indoor Plants,5-Level Dimmable,Auto On Off Timing 4 8 12Hrs
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2 Reviews on Amazon
LED Grow Light, Full Spectrum Grow Light for Indoor Plants, Growing Light with Timer 3H/6H/12H and Adjustable Gooseneck, 5 Dimmable Levels and 3 Switch Modes (White) (White)
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Fluorescent bulbs

Fluorescent bulbs are common to find since they are cheap and easy to use. The bulls are not huge emitters of heat. However, the temperature can accumulate if you use several bulbs together.

In what ways should you control the temperature levels in a grow room?

Adding CO2

cannabis-co2

One of the ways you can manage the temperature in a grow room is by adding carbon dioxide to the air. When the air is full of CO2, plants can survive very high temperatures. However, you need an intense grow light that will make the plants grow faster hence increase their ability to stand the heat. Lights such as LEDs and HPS.

Using Fans in a grow tent

Fans in a grow tent

Fans alone do not get rid of the heat in a grow room. They, however, help improve the circulation of air by dispersing the heat the lamps emit and cooling down the plants. By adequately placing your fans around the grow room, you can use only a few fans to maintain the temperatures in an AC effectively.

Setting up an Exhaust Fan

You can set up an exhaust fan in your grow house in the ceiling vent to help reduce the amount of heat. Hot air moves upwards. By having the exhaust fan on the ceiling, it will suck out the warm air from the room and passively suck the cold air from the floor. It, therefore, helps in controlling airflow in your room with little effort.

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iLIVING 12' Shutter Exhaust Fan with Thermospeed(TM) controller, 65W, 960 CFM, Silver (ILG8SF12V-ST)
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iPower HIFANXEXHAUST12CTB 12 Inch Variable Shutter Exhaust Fan with Speed Controller and Power Cord Kit, 1620RPM, 1600 CFM, Silver
1,540 Reviews on Amazon
iPower HIFANXEXHAUST12CTB 12 Inch Variable Shutter Exhaust Fan with Speed Controller and Power Cord Kit, 1620RPM, 1600 CFM, Silver
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Changing the lighting schedule

During the vegetative phase, many growers tend to expose their plants to light for 24 hours so that they can hasten the growth. However, these actions result in exposing the plants to heat for long hours, which could lead to the plant damage. You can help reduce the temperature dramatically by setting several hours of no light to the plants.

Even with the urge to maximize light exposure to cannabis, too much of it does not guarantee the best growth results.

Using a Heat resistant strain

Heat resistant cannabis strain 

You can quite easily find some cannabis strains that are more tolerant of heat and can survive in a grow tent whose temperature is high. The strains are either Sativa or Haze. They are different from the Indica breed that originates from the cold regions. An example of such heat resistant strain is the Kaya Gold. It is a Sativa-dominant strain that is resistant to pests and east to grow. Choosing to use a heat resistant strain is the last resort you should take if you have not been able to control the temperatures of your grow tent.

Using Supplements against heat stress

Interestingly, several supplements can help your plants deal with heat stress by effectively reducing the negative impact of heat stress. No one supplement is the best at helping in heat resistance. They will all give you the same result. You should use these supplements if you have no other method left to use to clear the high heat in your grow tent.

Using Reservoir chillers

Just as important as it is to maintain the grow room temperature in a hydroponic setting, it is also of importance to maintain the temperature of the reservoir outside the grow tent. When the temperature in the reservoir is way above 70 degrees, dangerous algae may start developing. You should, therefore, get yourself a reservoir chiller.

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Raising the Lights

Sometimes it takes just changing the position of your lighting in the grow room to make the difference of how heat affects your marijuana plants. If the light produces heat that burns the canopy of your marijuana plants, you can temporarily raise the bulb by 10 inches. You may as well opt to dim the lights.

Using the lights at night

Since the temperatures are always cooler in the evening more than during the day, you may set up your hot grow light at night hence creating a suitable environment for your marijuana plants to grow.

Using Silica supplement

silicate-growing-cannabis

An extra dose of silica to your cannabis plants may do lots of good in making your plants heat and cold resistant. The silicate will provide you with the best results if your cannabis is already experiencing some stress. When the silica gets into the plants, it hardens the cell walls of the plants giving the plants resistance to some diseases, heat, and cold.

Summing up

Looking back at all the ways you can use to control the temperature in your grow room, one common factor that stands out is you need to have a working and effective ventilation system in your grow room. Without it, air will not flow freely; hence controlling temperature becomes a problem. It may eventually lead your cannabis plants to suffer. However, now that you are familiar with some of the different ways you can use to get rid of the excess heat in a grow room, It will become less challenging to handle the heat problem in your cannabis farm.

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MARS HYDRO Grow Tent Kit Complete 2x2x5ft TS 600W LED Grow Light Full Spectrum Indoor Grow Tent Kit 24"x24"x55" Hydroponics Grow Tent 1680D Canvas with 4” Ventilation Kit for Grow Tent Complete System
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IPOW Grow Tent Kit Complete 3.3x3.3ft LED Grow Light Dimmable Full Spectrum Indoor Grow Tent Kit 24'x24'x55' Hydroponics Grow Tent with 4 Inch Ventilation Kit
80 Reviews on Amazon
IPOW Grow Tent Kit Complete 3.3x3.3ft LED Grow Light Dimmable Full Spectrum Indoor Grow Tent Kit 24"x24"x55" Hydroponics Grow Tent with 4 Inch Ventilation Kit
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  • Ventilation System: Made Of Exhaust Fan And Carbon Air Filter: Odor Control And Effective Keep The Moist And Temperature Under a Better Growing Air Environment.
  • OTHER GROWING TOOLS: 2X3 GAL Fabric grow pots ,3 PCS 1/2 GAL Plastic Nursery Pots For Seed Start, 1X PH Tester, 1 Thomometer,1 Cultural Steel Tray,1 Leaf Grinder And 2 Pipe For Hobby User
-$70.00 SALE OFFBestseller No. 4
VIVOSUN Grow Tent Complete System, 4x4 Ft. Grow Tent Kit Complete with VS1000 Led Grow Light 6 Inch 440CFM Inline Fan Carbon Filter and 8ft Ducting Combo, 48'x48'x80'
135 Reviews on Amazon
VIVOSUN Grow Tent Complete System, 4x4 Ft. Grow Tent Kit Complete with VS1000 Led Grow Light 6 Inch 440CFM Inline Fan Carbon Filter and 8ft Ducting Combo, 48"x48"x80"
  • Complete Kit Included: 48x48x80-Inch grow tent, 6 Inch 440 CFM Inline Fan, carbon filter, 8 feet of ducting, 2 stainless clamps, VS1000 LED grow light, grow room glasses, rope hangers, 3x3-ft. elastic trellis netting, 5pcs 5 gallon grow bags, temperature humidity monitor, pruning shear, and digital timer
  • Promote Plant Growth: VIVOSUN grow tent is equipped with a lined zipper double stitched to avoid light leaks; is made up of 100% reflective Mylar, ensuring the plants absorb the nutrients through the internal lights
  • Lower Costs & High Efficiency Light: VS1000 LED grow lights use the latest LED plant light technology, including Samsung LM301 Diodes, high-energy efficiency with 2.75 μmol/J; Extremely high output but consumes only 100W of electricity, making it more efficient than traditional HID lamps and other plant lamps on the market
  • Strong Support for Plants: Elastic trellis netting provides a sturdy support structure; The grow bags provide excellent air circulation and drainage; The design of pruning snips is perfect to use whether you are right- or left-handed with ease; The digital timer, thermometer, and hygrometer make it extremely easy to control the environment in your grow room
  • Advanced Grow Made Easy: The tent is supported by strong metal poles that are specially finished for smooth installation; Don’t waste time buying and returning parts that may or may not be compatible or safe to use together! This VIVOSUN complete system includes every part you need to get set up for advanced grow
Bestseller No. 5
Spider Farmer Grow Tent Kit Complete 3x3x5 SF-1000 Dimmable Samsung Diodes & Meanwell Driver, Grow Tent Complete System 2.3x2.3ft Growing Tent Kit Set 27'x27'x62' with 4 Inch Inline Fan Carbon Filter
697 Reviews on Amazon
Spider Farmer Grow Tent Kit Complete 3x3x5 SF-1000 Dimmable Samsung Diodes & Meanwell Driver, Grow Tent Complete System 2.3x2.3ft Growing Tent Kit Set 27"x27"x62" with 4 Inch Inline Fan Carbon Filter
  • TOP NOTCH QUALITY LED GROW LIGHT: Use Samsung LM301B diodes and MEAN WELL driver; full spectrum light ideal for all stages of growth; adjustable light intensity with dimmer switch; protective coating on LEDs helps extend the lifespan; no fan, zero noise. Only consumes 100w, running 50% less power than other Blurple lamps or HPS. This light delivers a powerful light output and uniform canopy penetration resulting in maximum yields.
  • DURABLE & STURDY GROW TENT: 100% Reflective Mylar interior maximizes the efforts of grow lights; heavy-duty 1680D Oxford cloth exterior adds durability; reliable SBS zipper shut and open smoothly; double stitching for strength and light protection; well-constructed with strong and sturdy steel frame; plenty of openings for fans/ vents/ electrical cords; removable viewing mesh screen for viewing & removing humidity; bottom tray prevent water leakage on the floor and keep tent stay clean.
  • POWERFUL VENTILATION SYSTEM: Quiet and powerful 4” Inline fan and RC412 Australian carbon filter and flex aluminum ducting combo; very easy to install and use; gives strong airflow and proper air circulation.
  • MONEY & ENERGY SAVING COMPLETE GROW TENT KIT: Compare the cost of individual items and the cost of our complete grow tent package, our kit saves $$ and a lot of time vs buying each item separately. Designed to be user-friendly; comes with easy-to-follow installation instructions; is easy to assemble and is very simple to operate, even for beginner growers. All parts are compatible and properly matched; everything comes in 1 box with discreet packaging.
  • VALUE FOR THE MONEY: Getting a high-quality grow tent kit means that you’ll get more value for a longer period of time. All parts are backed up by local maintenance centers in the USA. As a manufacturer specializing in the production of Led grow lights for more than 10 years, Spider Farmer has been insisting on creating more efficient, more suitable and better quality home grow equipment, being a trusted partner for every grower!
5/5 - (6 votes)

Bowden draws from over a decade of home growing experience as well as consulting for small-scale and hobbyist-level growers. He has written hundreds of articles, thought pieces, and tutorials about growing cannabis at home

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