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.
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.
Table of Contents
- What are the effects of high temperatures in a grow tent?
- What are the effects of low temperature in a grow tent?
- What is the ideal temperature in a marijuana plant?
- Best Equipment About Climate Control For Grow Cannabis Indoor 03- 2023
- Getting to know your lighting system
- In what ways should you control the temperature levels in a grow room?
- Summing up
What are the effects of high temperatures in a grow tent?
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?
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 03- 2023
- 💙💙US ETL Certificate Listed. ITC-608T thermostat temperature and humidity controller is ETL listed, and rigorously tested for quality control and safety.
- 💙💙Three in one Multifunctional Temperature and Humidity Control Mode with Dual Relay Output. ITC-608T can work as a temperature controller, a humidity controller, a temperature and humidity controller. First, only plug temperature sensor with cooling and heating equipment. Second, only plug humidity sensor with humidifier and dehumidifier equipment. Third, plug both temperature and humidity sensor with cooling/heating and humidifier/dehumidifier equipment.
- 💙💙Supporting calibration, compressor delay and saving reset setting values. Centigrade or Fahrenheit degree display, easy to set, PV and SV dual display windows. And with compressor delay for protecting cooling device. ITC-608T can save the original setting values in case accidentally power-off.
- 💙💙More power up to 1800W. Temperature control range is -40-212°F(-40-100℃), humidity display range is 5 -99.0%RH. Max Loading: 120V 15A 1800W. Temperature senor is waterproof while humidity sensor is not.
- 💙💙Multifunctional usage. Temperature and humidity controller ITC-608T can be used in home brewing (refrigerator), fermenting, Greenhouse, terrarium, reptile, planting (mushroom), meat storage and cooking.
- 【Plug n Play】no more complicated wires are needed, and the programable temperature controllers is friendly to growers, staters.
- 【Buzzer Alarm】High and low temperature/humidity alarms support custom adjust.
- 【Dual relay】Both controllers offer two power outlets. Plug-in heating equipment, and ventilation fan on the temp controller, and plug the humidifier and dehumidification equipment on the humidity controller.
- 【Affordable】DIY the ventilation system for your grow tent gets more fun but costs less than getting a pre-set ventilation system.
- 【Reliable】Inkbird is the first one to offer pre-wired temp/humidity controllers.
- Designed to ventilate hydroponic grow rooms, transfer heating/cooling, cool AV closets, and exhaust odors.
- Dynamic temperature and humidity programming, with timers, grow cycles, scheduling, minimum speed.
- Connect with our app via Bluetooth to access advance programs, alarms, notifications, and view climate data.
- Mixed flow design combined with a PWM-controlled EC-motor for a truly quiet and energy efficient performance.
- Duct Size: 6” | Dimensions: 7.9 x 12.6 x 8.4 in. | Airflow: 402 CFM | Noise: 32 dBA | Bearings: Dual Ball
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.
- 1 x 150W HPS Bulb
- 1 x 150 watt Grow Light Fixture
- Complete set, easy to set-up and use
- Highly reflective 98% German aluminum insert for better uniformity, output and diffusion.
- 2 years warranty any issue contact customer service with order ID
- 600W Digital Dimmable Electronic Ballast: Support 120V/240V Input; Dimmable Options: 50%, 75%, 100%; 8 Feet heavy-duty power cord included; Stable power output ensure flicker free light
- 1 x 600W Super HPS Bulb 2100K; 1 x 600W MH Bulb 6000K; Optimized spectrum and high PAR (Photosynthetic Active Radiation) to promote healthy plant growth and soonest flourish
- 1 x Pair of 8-ft adjustable Ratchet Clip Hanger Rope: hold up to 150 lbs; 24-hour Plug-in Mechanical Timer: 15 minutes increments
- 19-inch Wing Reflector: up to 4' x 4' light coverage; Built-in 15 feet heavy duty lamp cord with E39 Ceramic Mogul Socket and standard Hydroponic S-Plug; highly 95% reflective textured German aluminum maximizes the light reflected to the plants
- CAUTION: This system will generate too much heat to be used in an enclosed area without ventilation. Adequate ventilation is required for all iPower grow light systems. We recommend the use of an iPower inline fan
- High PAR and optimized spectrum: 1 x 1000w 2100K HPS bulb, 1 x 1000w 6000K MH bulb, promote healthy plant growth and soonest flourish
- Electronic ballast: 1000w digital dimmable, 50% 75% 100% power level, compatible with HPS and MH light bulbs by micro-chip programming, free heavy-duty power cord included
- High reflective: 19-inch gull wing reflector, up to 4' x 4' light coverage; built-in 15 feet heavy duty lamp cord with E39 ceramic mogul socket and standard S-plug; highly 95% reflective textured German aluminum maximizes the light reflected to the plants
- Comprehensive accessories: 1 pair of 8-ft adjustable ratchet clip hanger rope, up to 75-pound weight load capacity per ratchet, hold up to 150 lbs. 24-hour plug-in mechanical timer, programmable, 15 minutes increments
- Caution: This system will generate too much heat to be used in an enclosed area without ventilation. Adequate ventilation is required for all iPower grow light systems. We recommend the use of an iPower inline fan
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.
- 6000K White Light - equipped with 10 Red + 74 White LEDs, this growing Lamp is similar to the full-spectrum sunlight at noon,that is professionally designed for indoor garden plants.Moreover, its color rendering index is as high as 95, the light is soft and flicker-free, which is very suitable for reading lamp
- Timer Function & Multiple Settings - this growing light offer the circular memory timer function with 3 options-4h/8h/12h. When keeping power, it can automatically turn ON/OFF in a 24-hour period according your settings, no more manual operation for you.
- Easy to Install - with flexible Gooseneck & strong clamp,it allows you to place the growth light in any direction to provide the best lighting angle for your plants，meet the cover around the plant.Powered by USB or AC Power Plug
- High Efficiency LED Lamp - as for LED power draw this seedling lights just comsume about 10watt and is equavalent to a 50W Halogen Bulb.Estimately monthly cost roughly $2 in electricity (12 hours a day). It is a great gift if you growing some small house plants.
- 【365 Days Worry-free Warranty】GooingTop service team offer 365 days warranty and 24h friendly customer service. If there are ever any issues about the product, please feel free to contact us and we will send you a new replacement or full refund.
- Full Spectrum: Barrina LED grow lights 4ft provide indoor plants with full-spectrum sunlight replacement. It provides the most reasonable grow light wave based on the ratio of the absorption of the plants
- Super Bright and High PPFD: Consuming only 252W with 1152 LEDS totally, replace 1400w general plant lights. Over 95% light energy can be absorbed by plants. The light efficiency can be increased by 17~20% with reflector. The shell of our light was made of 100% aluminum which provides the high-efficiency heat dissipation. Ensuring the longer service life of the led chips
- Easy Installation: With included tape, clips and cable ties, you could install the lights by yourself in minutes. You could link up to 6 led grow light strips in a series, saving your installation cost and time
- Eyes protection: These grow lights are suitable for planting plants in any indoor application. Color of light makes your eyes feel comfortable. It works extremely well for your plant grow tents, plant grow shelves, seedling cultivation, hydroponic rooms, greenhouses, etc
- What You Get: 2 years warranty. 6 x Barrina LED Grow lights, 3 x Power cords with ON/OFF switch, 5 x Connecting Cords(48''), 6 x Small Connectors, 24x Installation Clips, 12 x Tapes, 24 x cable ties
- 【 HIGH PERFORMANCE 】 This full spectrum LED grow light is designed to provide the benefits of natural sunlight your plant needs at different stages of growth. It is enhanced with 12 additional advanced red lamp beads (660 nm) which encourage seed growth, photosynthesis, and flowering or fruit production. It is also cost-effective and generates LOW HEAT!
- 【 EASY INSTALLATION 】 Our grow light is plug-and-play and able to be LINKED UP to 4 units together (using the 5FT power cord provided) for additional boost. The fixture can be flush mounted or hung with 2FT hanging cables (included in the package). You can use these lights in most indoor areas, such as shelving units, kitchen cabinets, grow tents, garages, basements!
- 【 DURABLE DESIGN 】 This professional Grow Light is FCC-certified and comes with a 1-year limited warranty. It is damp rated for use indoors in humid conditions. The modern design is in a light-weight enclosed housing, which prevents build-up of dust. Rated with a 30,000-hour lifespan. 100% satisfaction guaranteed!
- 【 HEALTHY LIVING 】 Building an indoor garden has never been easier! Grow your own organic lettuce, tomatoes, strawberries, herbs, thyme, rosemary, basil, mint, sage, peppers, perennials, garlic, and much more!
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
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 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.
- VERSATILE FAN: Ventilation fan helps eliminate , tobacco smoke, and cooking odors and can be installed in either the ceiling or wall
- EFFICIENT: Operates on 70 CFM and has a 6.0 Sone rating to ensure a peaceful surrounding when in operation
- EASY INSTALLATION: Torsion springs grille mounting - no tools necessary for a quick and easy installation. Compact housing fits easily between ceiling joists or wall studs
- DECORATIVE: Paintable polymeric grilles allow you to ensure the fan is cohesive with your existing decor
- FEATURES: Plug-in, permanently lubricated motor with the Broan-designed polymeric blower wheel for high-quality operation every time
- 12 Inch Variable Speed Shutter Exhaust Fan with automatic shutters
- UL Listed with speed controllable, permanently lubricated motor
- Corrosion-resistant with OSHA compliant wire guards
- Galvanized steel frame with aluminum shutters and fan blades
- Comes with features of newest Thermospeed(TM) Controller ILG8SFST
- 【Stable & Durable Exhaust Fan】: The ventilation fan is made of high-quality metal materials, with a bright surface, anti-corrosion, anti-scratch and prevent inhalation of foreign objects. Compared with other competitors' products, it can withstand moisture and high temperature, provide a stable working environment for the ventilation fan, and longer life of the ventilation fan.
- 【EFFICIENT VENTILATION FAN】 - Adopts double ball bearing outer rotor brush-less motor to ensure high efficient, quiet operation and high-quality performance. Compared with ordinary motors, the upgraded motor can reduce friction coefficient, save electricity effectively and enlarge the service life of the machine.
- 【EASY TO INSTALL】- Suitable for wall or ceiling installation. The exhaust fan is recommended to fix with glue or screws.Convenient to clean, you can remove the motor by unscrewing the four-corner screws. The detachable design is convenient for cleaning up fragment or greasy dirt regularly for increasing service life.
- 【Widely used wall ceiling ventilation fan】It is an ideal choice for creating efficient indoor HVAC system among workshops, basements, warehouses, apartment, kitchen, bathroom and other areas that require continuous or regular ventilation.High power bathroom exhaust fan can remove exhaust gas and ventilation with quickly and quiet way.
- 【100% after-sales service】For All customers, this product comes with Lifelong Technical Support & 24 hours Premium Service. If you have any issues about the ventilation fan, please contact us first, we will give you the satisfied solution as soon as possible.
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
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.
- The EcoPlus Commercial Grade Chiller of 1.5 HP is suitable for use with reservoirs, hydroponic systems and aquariums in fresh or saltwater
- Includes with 2 fittings, 1” outlet and 1” outlet, remote controller with 30 ft. cord, pump is not included
- Features a commercial-grade titanium heat exchanger for optimum performance and corrosion resistance
- High-quality Japanese compressor is extremely efficient and reliable
- Chiller dimensions – 15” W x 41“ L x 24“ H, Recommended pump – EcoPlus 1267 gph, Voltage – 120V 60Hz, Recommended tank size (hydroponic application) – 300 gal, Recommended tank size (aquarium application) – 300-500 gal, Volume (Cubic Feet): 8.542
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
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.
- An advance grow tent kit with smart controls and integrated components to start an indoor growing system.
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