Grow Set Up

A good grow set-up is essential for a good cannabis grow! Here we offer guidance for what you will need to set-up your grow depending on your space and goals. We provide our recommendations for the best grow tents, ventilation equipment and climate control accessories for your indoor cannabis grow.

Grow Tents & Spaces

Grow Tents

Grow tents allow you to control the climate and light that your plants experience. They also provide a reflective interior to help maximize the efficient use of light.

The size of your tent depends on the space you have available, the grow lights that you plan to use, and your harvest goals. We give you a rough idea of what you can expect from each size tent.

3x3 Grow Tent
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A 3x3 (1meter x 1meter) tent is perfect for many home growers who are looking to secure their own supply. These tents should be run with about 400 true watts of light and you can expect to harvest 6-12 ounces.

Be aware of vertical height! Tents smaller than 3x3 are often very difficult to grow in effectively because they are too short! Grow lights must be kept a certain distance from the plants and you need room for pots. We recommend a tent that is at least 5 feet tall.

4x4 Grow Tent
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A 4x4 (1.2meter x 1.2 meter) tent is pretty much the standard for most home growers. These tents should be run with about 600 true watts of light and you can expect to harvest 11-22 ounces

Both Dr. Photon and I use 4x4 tents. I use the Apollo Horticulture Grow tent that is pictured and linked in the US Amazon. In all marketplaces we carefully selected the best grow tents for quality and price.

5x5 Grow Tent
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With a 5x5 (1.5meter x 1.5meter) tent you can really increase production. These tents are designed for 1000 watts of light and you can harvest 17-35 ounces.

Create Your Own Grow Space

If you do not want to get a grow tent, then there are a few products that you can use to help modify your existing space to be reflective and sealed.

Panda Film
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Panda Film is white on one side and black on the other. The black provides light protection from outside light sources during the dark period. The white side is over 90% reflective and helps increase the efficient use of your lights.

Mylar Film
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Mylar film is more reflective than Panda film, but it is not as easy to work with. This is great to use to line the walls if you are converting a small room or closet, but it is not convenient for sealing openings or doors.

Aluminum Foil Tape
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Whether you are using a grow tent or creating your own space, aluminum foil tape is incredibly useful stuff.  You can use it to seal up light leaks or cover any light absorbing items in your tent. I used it to cover the bench inside my tent.


Exhaust Systems

In a ventilated grow space, the exhaust system is one of the most critical components.

The exhaust system that you need will depend on the size of your grow space, the heat generated by your grow lights, and the climate that you are working with.

4" Exhaust Kit
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These exhaust systems are perfect for a 4' x 4' tent running LED lights. I use the iPower Kit linked for the US. It works well in my set-up. I have left the fan on full time during several grows and it continues to run well. The iPower Kit is available in Canada, but Vivosun offers a comparable kit at a much better price, so that is the option that we linked. The Kit linked for the UK is comparable and includes the same accessories. The kits all come with a 4-inch inline extraction fan and carbon filter to control smell. They include some ducting as well, but you will likely need more.

6" Exhaust Kit
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These 6" exhaust kits are adequate for small HID set-ups or LED rooms up to 6’x6’. The fans that are included are more powerful than the 4" options above and if you are concerned at all about managing heat or humidity these kits would make a better choice.

Exhaust Fans

If you are running High Intensity Discharge (HID) lights such as HPS or MH, you may need a more powerful exhaust to help control the heat that the lights create.

The best type of exhaust fans are centrifugal or mixed flow, which can handle pressurizing a room. Dr. Photon recommends mixed flow for most situations because it has the advantage of moving more air.

6" Mixed Flow Fan
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The AC Infinity Cloudline 6” Mixed Flow Fan is our choice in the US. It is a good mixed flow fan which comes with its own thermostat and is suited for rooms up to 5' x 5'. It is a great value in the US, but expensive in Canada. In the UK we linked an HG Power fan which is comparable in power and build quality.

Carbon Filters

Carbon filters attach to the intake end of your exhaust system (inside the grow space). The exhaust fan pulls air through the filter (and then through the hood of HID lights), and then pushes it out of the grow space.

4" Carbon Filter
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I use the iPower carbon filters linked for US and Canada. They hold up well and do an excellent job controlling the smell of flowering cannabis plants. The Ram Filter linked for the UK is comparable.

6" Carbon Filter
If you have a 6" exhaust system you will need a 6" carbon filter. Different pricing and availability led us to select different brands in each amazon market.

Mufflers: Noise Reducers

4" Muffler
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Mufflers or sound reducers dramatically reduce the noise from exhaust systems. They attach to the exhaust end of your exhaust system and absorb most of the noise that comes out with the air flow.

6" Muffler
I use a muffler because my tent sits in my office. Without a muffler, I would not be able to get work done!

Duct Clamps

4" Turn-Key Duct Clamps
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If you have 4” fans and ducting, I highly recommend  these clamps. They can easily be secured and removed without tools, which is super convenient even if you have the tools. Well worth the simplicity when you must change a component or re-run a line while hovering over your plants.

6" Turn-Key Duct Clamps
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If you use 6" ducting, this is the set of clamps for you. We are looking for similar products in Canada and the UK.

Semi Rigid Duct Hose

I use and recommend “Semi-Rigid Flexible ducting”. It has much better airflow than other flexible ducting, which improves the efficiency of your fans. It is easy to shape into any position and it holds its shape. 

4" Semi Rigid Ducting
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Semi Rigid Ducting for 4" diameter ventilation systems

6" Semi Rigid Ducting
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Semi Rigid Ducting for 6" diameter ventilation systems

Intake Fan

Using active intake is the best way to control the climate inside your grow space. If you use a good exhaust fan without an active intake fan, the exhaust fan will practically cause the tent to implode. In small grows with little heat or humidity to manage, you may be able to do without and use passive air intake.
The goal with active intake is to help balance air pressure, but you always want the exhaust fan to be more powerful than the intake. You want to avoid the cheaper inline fans that will not work against any resistance. You also want to avoid high powered fans that would eliminate the negative air pressure in the tent.

6" Duct Booster Fans
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These 6" duct booster fans are great options for active air intake in most grow tents. They will pair well with any of the exhaust kits that we link above.

Intake Pre-Filters

One-Gallon Fabric Pots
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This is a hack! Rather than paying for relatively expensive intake prefilters, I simply attach these  fabric pots to the intake end of my ducting with duct tape. Fabric pots work better than most other materials as they stop dust, insects, and light, but do not significantly reduce airflow.

Climate Control

Thermometers & Hygrometers

In order to control the climate, you first have to know what it is!

Ambient Weather WS-10
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This weather station system is unmatched for complete environment metering. It has Radio Frequency remote sensors and is capable of monitoring up to 8 receivers. You can place the main display anyplace that it is convenient and monitor the heat and humidity at several places inside your grow space. This is a very powerful climate monitoring tool suitable for any size grow!

Hygrometers with Probe
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For a somewhat less expensive option, we recommend getting a hygrometer with a wired probe that can measure the temperature and humidity inside the grow space. You can mount the unit outside the tent and run the probe into the tent through a port. I have two similar hygrometers and use them in different ways on every grow.

Be aware, many similar units have a wired probe that only measures temperature. They may appear to measure both temperature and humidity, but they measure humidity at the base station not with the probe. The units that we recommend here all measure both Temperature and Humidity with probes.

Check out our "Measuring Equipment" page for other Thermometer/Hygrometer options!

Circulating Fans

Inside the grow space it is important to keep the air moving around. You don't want too much wind, which can injure plants, but you need to keep the air moving to maintain optimal conditions for growth and to reduce the chances for pathogens. We recommend using two fans to move the air around in most grow spaces. Consider your budget and your grow space and you can choose among the following options.

Ozerri Brezza Dual Oscillating Fan
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I was in the market for a new fan and ordered this Ozerri Brezza fan on the recommendation of Dr Photon. It is practically unique in that it has dual oscillation (vertical and horizontal). I rarely leave the vertical oscillation running, but it can be easily pointed in any direction. It also has a good low speed, which is important for blowing around plants.

8" Oscillating Fan
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These little fans are ubiquitous in grow tents! They are small and convenient and are the best low budget option for oscillating fans.

6" Clip Fan
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These are the easiest way to blow air around the canopy during the flowering period. Just clip the fan to a tent pole and you can position the breeze just over the top of the canopy.


I live in a very dry climate, which is perfect during most of the grow because the plants themselves produce a lot of humidity. However, early in the grow when the plants are small I must use a humidifier to create the ideal environment for seedlings and young plants. We recommend ultrasonic humidifiers as they do not use heat to create humidity, but Instead atomize water through ultrasonic vibrations. The absence of heat is important so that it does not interfere with the grow room's natural balance and create more problems than it tries to solve.

Large Ultrasonic Humidifier
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If you live in a very dry climate you should invest in a larger humidifier. I have the 6 liter model linked for the US and UK. It is too expensive in Canada, so we choose a slightly smaller model as the best available deal. These units can run 24 hours on high and put out a good stream of vapor. In the event that you forget, they all feature automatic shut-off.

Small Ultrasonic Humidifier
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If you only need a little bit of additional humidity, you can consider a smaller, 2-liter humidifier. These are all solid choices for a small ultrasonic humidifier.


Most growers can control humidity by leaving the exhaust running. Dehumidifiers are needed only in sealed rooms, or climates with very high humidity. Dehumidifiers can be helpful for grow rooms where high humidity is a problem, however, a problem with dehumidifiers is that they create heat. We do not recommend simply exhausting the hot air because doing so also removes the dry air and defeats the purpose. In hot and humid areas, you may need to seal the grow space (limit air exchange through exhaust) and use a double vented air conditioner along side a dehumidifier.

Frigidaire 30-Pint Dehumidifier 
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This unit can remove 30 pints of moisture per day, which should be adequate for most grow tents. If you have a large grow space with a humidity problem then they also offer a 70-pint version.


Air conditioners are very useful when exhaust systems can no longer control heat. You can get AC units that are single or double vented. Single vented units are fine for most set-ups when you are not using a dehumidifier.

Single Vented Portable A/C
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The BLACK+DECKER 8000 BTU Portable Air Conditioner Unit is a very good choice for a single vent AC unit. We are researching the best options from the UK.

Double Vented Portable Air Conditioner
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If you are using a dehumidifier, a single vented unit should be avoided because they will vent the dry air from your grow space. When AC is used in combination with dehumidifiers, you should use a double vented unit.

The Whynter Dual Vent Air Conditioner is an excellent choice for a dual vent AC. We are researching the best options from the UK.

Oil Heater

If it is too cold in your grow space, you may need to add a heater. We do not recommend using fan heaters, or any heating system that can create a fire risk if something were to happen. Oil heaters are the best option for heating as they distribute their heat safely without getting overly hot on the surface.

Delonghi Oil Heater
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Dr Photon uses and recommend this Delonghi Oil Heater.

Dual Systems Controller

Inkbird Itc-308 Digital Temperature Controller
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A dual system controller allows you to connect and control two climate control appliances. For example, Dr. Photon uses it to connect his exhaust system and his oil heater. When it is cold, the controller switches the oil heater on. When it is hot, the controller turns the exhaust system on. You can set the operating range of each appliance separately so that there is a threshold between the two systems, and they do not compete with each other.

About Our Product Recommendations

At Coco for Cannabis, our mission is to help growers maximize the success of their cannabis crops by providing scientifically accurate information and sharing proven growing practices.

The products that we recommend are the actual products that we chose to purchase and use ourselves. In a few cases, we recommend products that we would buy if we needed them. We do not accept advertising and will not recommend any product that we would not buy for ourselves. We offer this guide as a resource to growers.

We may receive a referral when you purchase products through this page. This is the main revenue stream that keeps Coco for Cannabis up and running! When you click through our links and make purchases you are supporting our work! As an Amazon Associate, we earn from qualifying purchases.

Whether we receive a referral does not influence our recommendations. For example, when products are cheaper to buy locally, we’ll tell you that rather than just recommend a more expensive online option.


The information on should not be considered as financial, legal, or medical advice. You are responsible for knowing and following the local laws that pertain to cannabis cultivation, possession, and use. Decisions to grow cannabis should be made in consultation with a lawyer or qualified legal advisor. Decisions to use cannabis should be made in consultation with your doctor or medical professional.