Last updated on January 30th, 2020 at 08:14 am
So, are you looking for the Best Temperature & Humidity Controllers for Growing Cannabis in 2021?
Do you know?
Marijuana best grows when it has a certain humidity and temperature levels. If you have too high or too low temperature/humidity, then the marijuana plants can weaken and damage.
If you are one of those people who love to control the environment around your plants, then you will love this post.
When you grow cannabis inside your house or in a grow tent, it is very important to keep a check on the factors like temperature, ventilation, and humidity.
Therefore, to help you out and make things simpler, we have written this post.
This post includes 4 section: Controllers, Humidifiers/Dehumidifiers, Coolers/Heaters, and Instrument section.
Instruments – this section contains a few detailed reviews of things like best hygrometer and excellent thermometer, which you can use to monitor the environment situation inside your grow tent.
Humidifiers/Dehumidifiers – this bit contains the reviews of the best humidity controllers. If you have too much humidity in your area, then you can use dehumidifiers to reduce it and vice versa.
Coolers/Heaters – if you got the very high temperature or very low temperature, then you can use these coolers or heaters depending upon how you want your plant’s environment to be.
Controllers – in this section we are going to review some of the very best overall humidity, CO2, lighting and temperature controllers on the market which you can use to make the whole marijuana environment control process automatic.
What to look for?
Have a look at the complete buyer’s guide of 10+ Best Temperature & Humidity Controllers to Grow Cannabis.
Free Advice for you:
- 1 Instruments
- 2 Humidifiers and Dehumidifiers
- 2.1 DampRid FG50T Moisture Absorber – Best buy if you don’t want to increase electricity bill
- 2.2 Ivation IVAGDM20 Dehumidifier – Perfect for a small room
- 2.3 Frigidaire FAD504DWD Dehumidifier – Editor’s choice for Dehumidifier
- 2.4 Holmes HWM6008-NUM Humidifier – EDITORS CHOICE for the best humidifier
- 2.5 Holmes HM1865-NU Humidifier – Programmable cool mist humidifier
- 3 Heater and Coolers
- 4 Controllers
- 4.1 Ink bird IHC-200 Humidity controller – Amazon’s choice for humidity controller category
- 4.2 Intermatic DT122K Digital indoor timer – Best small indoor timer with good reviews
- 4.3 Inkbird ITC-308 Digital temperature control unit – Best for controlling the coolers and heater
- 4.4 Autopilot master digital timer – ALL IN ONE controller
- 4.5 Titan Controls Saturn 4 & 5 – Environment controllers with CO2 and Photo cell variants
- 4.6 Titan Controls HYPERION 1 – EDITORS CHOICE FOR THE BEST WIRELESS CONTROLLER 2021
So, let us start with our first section…
We have three really good products for you which will help you monitor the temperature and humidity inside your room or grow tent while growing marijuana.
All 3 of them are really good products which have a big fan base on amazon along with great reviews.
Bjerg Instruments Thermometer and Hygrometer – Antique looking temperature & humidity reader
This is a combo of thermometer and hygrometer to check temperature and humidity respectively.
This instrument has got 4.1 stars out of 5 by nearly 350 happy customers on Amazon.
With easy to check 5.5-inch dial size you can easily see the temperature and humidity reading on it. The overall size of this instrument is 8 inches – diameter.
You will be able to check the temperature reading in both Celsius and Fahrenheit. You can hang it indoors or outdoors as well.
It will also look really good wherever you place it, the copper finish also makes it very durable and long lasting. The outer glass is also real and not plastic. The inner frame construction is done by using steel to give it strength.
The weight of this thermometer/hygrometer is only 2.4 ounces.
Ambient weather WS-07-C Thermo/Hygro meter – Digital Treat for you (EDITORS CHOICE)
Unlike the previous product, this thermometer and hygrometer combo is digital and will read you the numbers in digital format.
The big digits (1.25 inch) on the large display will make it easier to see the readings even if you are far away from it. You can use it as a standalone reader or pair it up with Ambient weather WS-07 Wireless system.
You can pair up to 8 more remote sensors if you like to extend the monitoring area. So, if you place eight sensors in different corners of the room, it will read all of them wirelessly and give you reading based on the whole area and not just the area where you have placed it. The sensing range of this meter is 300 feet.
Pretty cool eh?
They have also added the temperature and humidity calibration system to get the highest accuracy possible.
Want to know another great feature?
There is a scroll mode in this instrument which will allow you to read the reading without even touching any buttons. The screen will display all the sensors reading with a five-second viewing time automatically.
Also, you get a one-year warranty with it as well.
Checkout the table below to see the specifications:
|Temperature range:||-40 °F to 140 °F|
|Humidity range:||10% to 99%|
|Sensor Range:||300 Feet|
|Update rate:||60 Seconds|
|Console dimensions:||4.5 X 5 X 1 inch|
|LCD dimension:||3.75 X 3.5 inch|
Extech 445713 Hydrometer/Thermometer – Cheap indoor/outdoor hygro/thermo meter
This is another cheap instrument by Extech.
It is affordable and shows clear humidity and temperature reading on a big LCD screen.
One different thing about this meter is that you will be able to see both the indoor and outdoor humidity & temperature reading at the same time on the screen.
You get a mix/max and a reset switch on the side panel. There is a 35 inch outdoor sensor which is easy to install and will provide you with accurate readings.
You can use this hygro/thermometer in gardens; marijuana grow tents, food processing facilities or any other place you like.
You have two mounting options to choose from: wall mounted or placed on a flat surface.
Along with all that, you get the reading in both Celsius and Fahrenheit. Also, you get battery level indicator as well.
The following table shows the specs of this item:
|Temperature range:||14 °F to 140 °F|
|Humidity range:||10% to 99%|
|Console dimensions:||3.9 X 4.3 X 0.8 inch|
So, those were some of the meters you can use to monitor the temperature and humidity around your plants or room. Now let’s dive into the reviews of instruments to control the humidity inside your room, or the grow tent.
Humidifiers and Dehumidifiers
You don’t want to get your plants very humid or very dry, depending upon the humidity around your region you can either use humidifiers or dehumidifiers.
Below are five excellent buying options for you. We have got two reviews of the best humidifiers on the market, two reviews of very good dehumidifiers and one review for the best moisture absorber on the market in 2021.
DampRid FG50T Moisture Absorber – Best buy if you don’t want to increase electricity bill
This DampRid moisture absorber has got 4.2 stars from more than 1000 customers on amazon. People are buying it and loving it out there.
It’s the best way to control the moisture in the air without using electricity. Not only you can use this in marijuana grow tents, but you can use it in basements, garages, vacation homes, boats, RV’s and many other places.
It completely eliminates musty odors in large spaces. It’s a 4 pound tub which you can open and place anywhere you like, and it
will absorb all the moisture from the air.
No more Moisture damage!
If you have got an area of 250 square feet, then this tub will keep absorbing moisture for 6 months. Whereas if you have got a large area of 1000 square feet, then you can expect it to work for 60 days straight.
It is effortless to use product. You just have to open the lid and place it on a table, and it will start doing its work immediately.
Furthermore, it is completely safe to use around pets and kids.
Ivation IVAGDM20 Dehumidifier – Perfect for a small room
If you have a problem of too much moisture and humidity in the air, then this is a life saver. You can use it in rooms, boats or RVs. Its compact, lightweight and does its job perfectly.
More than 1600 people have given it 3.6 stars out of 5, so it’s a nice product.
With thermoelectric peltier module technology, you can be sure that you won’t be facing any humidity issues and neither your plants would suffer because of humidity.
The collection capacity of this dehumidifiers is about 16 fl. Oz. per day at 86F and 80%RH. The total reservoir capacity is 20fl. Oz. It will work for about two days before you need to empty the reservoir.
You don’t have to worry about the noise as it is very quiet when operating, it does not have any moving parts so no more noise.
Whenever the reservoir is full, the machine will turn itself off automatically, and the lights will come on to notify you to empty it.
It’s very tiny, you can place it anywhere you like. It is best suited to places that are somewhere around 1100 cubic feet. The power input you need to provide to it is 9V 3A.
See this table to checkout the specifications:
|Dimensions:||5.8 X 5.3 X 8.8 inches|
|Reservoir capacity:||20 fl oz|
|Power Input:||9V 3A|
Frigidaire FAD504DWD Dehumidifier – Editor’s choice for Dehumidifier
Let’s blow your mind, shall we?
This dehumidifier has earned a 4 star rating out of 5 by more than 11,700 customers!
That is unbelievable, right?
This is the very best dehumidifier that you can get on the market in 2021. It’s a must buy for everyone who has a high humidity problem.
You don’t have to worry about molds and mildew that are caused by excess moisture anymore. This dehumidifier will also kill the bacteria in the air which make the air smell and hard to breath.
You can set whatever humidity percentage you want in the room, and it will do its works with 100% efficiency.
This is a continuous machine, meaning it has a drain pipe through which it will continuously drain the water that is collected, so no more emptying the tank.
If you do not have a drain nearby, then you can use its tank as well, in which case it will notify you when the tank is full and it will auto-shutoff until you empty the tank.
This dehumidifier will remove 50 pints of water per day from the room, that something yeah?
Other features include electronic controls, level indicator, and a washable filter.
You are going to save energy as it is energy star rated. Also, the manufacturer has provided wheels underside to roll it wherever you want with ease. You also get a 6 feet long power cord so that you can place it wherever you like.
You will also be provided with a 1 year parts and labor warranty and 5 years sealed system warranty.
The table shows you the specification of this product:
|Dimensions:||19.8 X 11.54 X 14.57 inches|
|Reservoir capacity:||16.3 pints|
Holmes HWM6008-NUM Humidifier – EDITORS CHOICE for the best humidifier
So, you have seen the reviews of dehumidifier but what if you live in an arid weather place? You will humidify your room a little bit for the plants to grow better.
This is Holmes warm mist humidifier; it is small and lightweight.
The construction is done out of high strength plastic, so its lightweight enough to take it with you anywhere you like.
It is best suited for small grow tents and small rooms. You can fill its 2.3-gallon water tank, and it will run for 24 hours straight before it needs refilling.
The plastic with which it is made has been infused with anti-microbial product protection, to prevent the growth of bad bacteria that can create bad odors and stains on the product.
You can choose between two different speeds as well. You won’t be needed any kind of replacement filters as it produces warm mist by boiling water.
Dimensions 15.9 X 29 X 14.6 inches
Reservoir capacity 2.3 gallons
Weight 4.95 pounds
Holmes HM1865-NU Humidifier – Programmable cool mist humidifier
This is another humidifier from Holmes. This product features a digital LCD control panel with which you can set up the amount of humidity you want around the room.
You get a 16 hour programmable timers which automatically turns the humidifier on and off.
There also a new feature in this humidifier which I called filter check, it checks the filter and alerts you in case the filter needs replacing.
The large 1.5 gallon water tank is easily filled and allow the humidifier to run for up to 48 hours.
The filter inside the humidifier is treated with arm & hammer baking soda as well as antimicrobial protection. You won’t have to worry about bacteria growing inside the humidifier anymore.
This one is ideal for a large sized room and has 3 speeds which you can choose according to the amount of humidity.
Although it is an excellent product and has good reviews on amazon, you might want to check out the reviews before buying it.
Dimensions 17.5 X 12.8 X 14.4 inches
Reservoir capacity 1.5 gallons
Weight 8.7 pounds
So, those were the humidifiers and dehumidifier reviews. Hopefully you got what you came here looking for. Now let’s dive into the detailed reviews of coolers and heater for your marijuana operation.
Heater and Coolers
In this section, we will show some air conditioner, heaters and ventilation fans that you can use to control the environment around our marijuana plants.
HoneyWell HT-900 Circulator fan – Bestseller on amazon
This is the very best ventilation fan on amazon right now; it has been sold to more than 15000 people who have given it a 4.2 rating.
If you want a ventilation fan for your marijuana operation then you should buy this without looking elsewhere. This is the best you can get out there at cheap price.
The air movement is done through the aerodynamic turbo force design of this fan. You can place it on a table or even mount it on a wall.
The size of the blades on this fan is 9 inches with an 11-inch outer casing. It is small and it weighs only 1 pound.
It is quite as well compared to other fans on the market. The head will pivot 90 degrees for easy rotation and you get 3 different speeds as well. The dimensions of this fan are 11.02 X 6.46 X 11.22 inches.
You also get a 1 year warranty with it.
Apollo Horticulture Heating mat – Editor’s choice for marijuana operation
This heating mat is made by Apollo horticulture. As you might know, Apollo horticulture makes so many marijuana products which are of very high quality and loved by the marijuana growing community.
More than 500 people have given this heating pad a rating of 4.4 stars out of 5. Which speaks volumes about its quality.
You get a 6 feet long power cord with this 9 X 20 inch heating pad. The weight of the heating pad is only 12.3 ounces.
What the use of a heating pad?
If you live in cold weather and want a little warmer environment for your marijuana plants, then this is the right product for it.
The heating pad will increase the temperature of the plant roots area by 10 to 20 F above the room temperature.
This will help the plant to grow better roots and germinate better and faster.
This heating pad is very safe to use. Apollo horticulture always makes sure of safety first in their product. This heating pad is held together by a network of internal wiring.
The heating pad is also waterproof to give you a safe cannabis growing environment. This is a really good product if you want to increase the health of roots and seedlings.
Holmes HFH436WGL-UM Heater fan – best heater for your marijuana grow tent
This is another Holmes product that we have on the list.
This is a heater to heat up the surrounding area of your marijuana plants. If you feel a need to heat up the temperature, then this might work good for you.
You can place it on a table top or you can even mount it up on a wall. It has easy to use digital controls that will help you to set the temperature that you wish.
If you are going to use it inside the grow tent, you might use water there as well, you do not need to worry then as this is ALCI safe.
You get 1 heat setting with a maximum of 1500 watt output. That would be enough to heat up a small room or a grow tent.
The noise level on this heater fan is only 60dB, measure from a 1.5-meter distance. You can even use the pre heat heater mode to warm up the room if you are using it for any other purposes than growing marijuana.
Additionally, you get a 1 year warranty with it as well. the total weight and dimensions of this heater are 3.4 pounds and 10.3 X 12.8 X 8.2 inches respectively.
Frigidaire FFRE0533Q1 Air conditioner – perfect to cool the marijuana grow room
Do you live in a very hot area? Or does your cannabis lighting system produce too much heat?
Well then, you can check this air conditioner out to cool down the room.
It is a 5000 BTU mini air conditioner manufactured by Frigidaire. It is a wall mounted device so you’ll need to sort out the placement beforehand.
The best-suited room area for this air conditioner is 150 square feet. You get ready,-to select electronic control which will help you set up the options very quickly and easily.
This is also a dehumidifier which is capable of removing 1.1 pints of water per hour.
You need to have a standard 115 V electrical outlet to use this air conditioner. It does not make a lot of noise when operating.
It also saves electricity and has a low power start up resulting in money saved. You also get a free remote control with which you can control the temperature settings wirelessly.
The 4 way air circulation system on this air conditioner is a good add-on that you get. You also get a washable filter with meshing that will help reduce the bacteria and odor from the air.
The overall dimension of this cooler is 15.2 X 16 X 12 inches. The total weight of this air conditioner is 42 pounds.
You get a 1 year labour and part warranty as well as 5 year sealed system warranty when you purchase it.
Let’s see some controlling unit now, shall we? These are controllers which will allow you to control various different kinds on devices and environment factors.
Ink bird IHC-200 Humidity controller – Amazon’s choice for humidity controller category
This is a humidity controller from Inkbird company. It helps you control the humidity automatically according to the setting you have input in it.
This controller can switch humidification and dehumidification modes automatically on its own. You can easily control the amount of humidity by either entering a value you like or by the use of differential value.
Once you have entered the desired values if the humidity increases or decreases beyond those values then this controller will start an alarm to alert you.
Along with that, if the sensor encounters an error or the humidity exceeds the limit, then the controller will send an alarm alert.
Isn’t that handy?
You can even calibrate the humidity values, can set up delay protection for control output and query current temperature with this Inkbird controller.
Being plug and playing device, it will work with almost all humidifiers and dehumidifiers that you might have at home. It can control any 100 to 265 volts humidifier, dehumidifier or a ventilation fan.
When you purchase this controller, you get a free user manual and 1 year warranty as well.
To know more about this product, please check out their official website HERE Please check the picture below to read its specifications.
Intermatic DT122K Digital indoor timer – Best small indoor timer with good reviews
Looking for a way to turn on and off your devices automatically?
Then worry not, here is the compact digital timer by Intermatic that will do just that for you.
This is a heavy-duty digital timer that will offer you a total of 7 on/off programmable settings for either day or weekly events.
You can even use the manual timer if you wish to set the times. Furthermore, it has an astronomic feature which will automatically adjust itself to sunrise and sunset.
It also includes daylight saving setting, so you don’t need to reset the device two times a year.
You can plug it in directly to the wall outlet and it will start doing its work. It is lightweight and compact so you can take it with you whenever you travel.
Other than marijuana instruments it can also control CFL lights and LED lights as well. The weight of the timer is only 2.4 ounces and the dimensions are 6.8 X 5 X 2.5 inches.
This digital timer is UL listed for safety and can work on any wall outlet which has 15amps and 125 VAC.
The rechargeable battery is included along with a 1 year warranty.
Inkbird ITC-308 Digital temperature control unit – Best for controlling the coolers and heater
This is a plug and plays digital temperature controller by Inkbird. You just need to hook up the heater or the cooler with it and it will start doing its job.
It has a dual relay output, meaning it can control heating and cooling units simultaneously. You can set the reading values in Fahrenheit or Celsius.
It supports temperature calibrations and you can even display both the set temperature and the measured temperature on display.
In case the temperatures go too high or too low, you will get notified with an inbuilt alarm. You also will be notified with an alarm if the sensors have problems or there overheating.
To protect the device and your plants from rapid changing temperatures, you can set differential function for heating and cooling.
Although it is a heavy-duty device, it is only capable of handling 1100W of power at a time. When purchasing this controller be sure to check out the instructional manual that is provided.
You will get a standard 1 year warranty for the product.
The total weight of this controller is only 15 ounces and the dimensions are 5.5 X 1.3 X 2.7 inches. You can visit HERE to see more information about this product on their official website. Checkout the picture below to see the specifications.
Autopilot master digital timer – ALL IN ONE controller
Do you want to control fans, heater, coolers, lights and other stuff together?
Then this might be a very good choice!
This is Autopilot digital timer which has a very precise digital time clock in it with inbuilt battery backup too.
This digital timer has dual timer functions as well as a 24 hours’ time clock. You can control the lighting systems on and off timing, can control cycle times for pumps, can even control CO2 injection, exhaust and intake times.
This master digital timer has a total of four outlets:
- The first outlet controls the pump or any recycling device.
- The second and third outlet control the daytime devices like lightings and light movers.
- And the fourth outlet controls nighttime devices like humidifiers, dehumidifier, coolers, exhaust/ventilation fans, and heaters. There are other two excellent features in this master digital timer:
- The first feature is called the high-temperature shutdown. In case the lighting systems or heater create too much heat and the ventilation stops working, the digital timer will switch off the heating sources on it own to save the plants.
- The other function is hot start protection. Whenever you restart your lighting system, the digital timer will wait for the lamp to cool off properly to avoid damages.
Isn’t this an indeed a smart device?
The recycling on and off range is from 1 second to 96 hours. The temperature sensor is of 3-inch length.
The total weight of this controller is 4.15 pounds and the dimensions are 9 X 12 X 10 inches.
PLUS, you get a 3 year warranty with it!
Titan Controls Saturn 4 & 5 – Environment controllers with CO2 and Photo cell variants
These Titan controls Saturn 4 and Saturn 5 are primary environmental controller that you can use to make your life easier.
Both are very identical when it comes to controlling different devices. Both the models will let you control and operate your heating, cooling, humidifying and dehumidifying devices.
Both of them feature 15 feet long remote sensors to monitor the temperature and humidity readings.
You can set your desired value of humidity and temperature and these controllers will make sure that during the day and at night the values are maintained.
One unique and different thing in the Saturn 5 model is that it also features a digital-based environmental control featuring a short cycle timer for CO2 enrichment.
The following table will show you the specifications of both the models:
Dimensions 12.2 X 8.8 X 6.4 inches
Weight 4.6 pounds
Warranty 3 years
Power input 120V 15A 60hZ
Titan Controls HYPERION 1 – EDITORS CHOICE FOR THE BEST WIRELESS CONTROLLER 2021
Ok, let us tell you that this is the very best controller you can buy in this year!
If you love going wireless, then this is a treat for you…
This Titan controls Hyperion 1 environmental controller is completely wireless and can be operated from 150 feet away.
This is the real deal!
No matter if its day or night, you can control the temperature and humidity inside your grow rooms with complete precision with this controller.
It does not end here…
You can even control your whole lighting system with this beast. Using the trigger cord sets that are provided with the package, you can configure when your lighting system turns on and of remotely from far away.
It also gives you features like high-temperature automatic shutoff, custom lighting schedules and 15 minutes cooldown with pre-set. It will even inform you when you need to change the grow bulbs (this is done by using an inbuilt odometer)!
Impressive, isn’t it?
WAIT there’s more!
This controller is also able to control the CO2 amount from 500PPM to 2500PPM. The humidity and temperature range on this controller is 20% RH to 90% RH and 45 F to 85 F respectively.
All of the details will be shown on this lovely little remote-control LCD screen. You will even get diagnostic codes alert when something changes in your grow room.
What more can you ask from a controller?
With all that, you also get a 3 year warranty if there are any manufacturing defects.
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All the products mentioned in this post are outstanding and all of them have good ratings as well. You can choose the products depending on your needs. Although we would like to recommend some of the products to our readers to help them make decisions.
This is the best digital instrument which is a must for anyone who wants to grow marijuana seriously. This Ambient weather thermo/hygrometer is a perfect option that we would like to recommend to every grower out there.
This Frigidaire dehumidifier is at the top of our list when looking out to reduce the humidity. More than 11,700 people have rated it a 4 star out 5, which says that this is one cool product. Buy it and say bye-bye to the mold and damps.
This one is a very compact humidifier for you guys. It is lightweight and does its job very well. The mesh filter inside it will help eliminate all the bacteria from growing inside it. Buy it now and tell us what you loved most about it!
We do not have to say anything about this product. You all know Apollo horticulture makes the very best stuff out there. Buy it now to get your plant roots some much-needed warmth!
Best Overall controller?
This is that one thing you should buy and place it inside your marijuana grow room today. It will make your life so much easier! You don’t need to worry about turning on and off all those lights, heaters, humidifier, etc. Just set it up once and you will be stress-free all day every day!
We did a lot of hard work to research and put this post out there for you with the very best products on the market. We hope we have helped you find your desired product and we welcome you to see our other posts where we have reviewed much other cannabis growing equipments.