How to Cool Grow Tent: 6 Best Tips

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Last Updated on March 5, 2023

One common issue indoor growers wrestle with heat. Ensuring your grow tents remain cool is of great importance so your plants can successfully make it to harvest time. So, we will be giving you the best tips on how to cool grow tents.

Fortunately, there are various things you can do to manage heat and ensure your grow tent is kept cool. So, by the end of this article, you should be able to know how to maintain a cool grow tent for the optimal growth of your plant.

Tips on How to Cool Grow Tent 

You must keep your grow tent cool and prevent building up excess heat. Too much heat can cause your plant to burn or even damage some of your growing equipment.

Depending on the extent of heat you’re managing or the size of grow tent you have, you may require one or several methods to keep your grow tent cool. Therefore, ensure you take into account the extent of heat you’re handling to know the approach to take in solving the situation.

However, even if the heat issue you have is not so big, we recommend you integrate more than one method for effective results.

So, below are some of the best tips on how to cool grow tent:

1. Use an air conditioner

One easy and fast way to cool your grow tent is to use an air conditioner. If you’re using a small tent, you can use one small air conditioner. It can be placed outside, close to your small grow tent in the same room you placed your tent. However, if you’re using a bigger tent, you will require a bigger air conditioner.

The only downside to this is that an air conditioner may cost you more electricity usage especially if your growing on a large scale. But all in all, using an air conditioner to cool your grow tent is one of the best and most effective methods you can go for.

2. Inline and exhaust fans

Another great method of cooling grow room tent is by making use of a combination of inline and exhaust fans. This will cycle in and out of the air in your tent. These fans work by bringing in fresh air into the grow tent and this is done by an inline fan. While the exhaust fan moves the inside air, which is usually hot, outside the grow tent.

3. Change your grow light to LED

If you continue to have heat problems in your grow tent, you may want to check the type of grow light you’re using. Some grow lights such as household CFL, HID, HPS, etc, produce more heat. Switching to grow light that will produce heat lesser heat (such as LED, fluorescent grow light, etc) may be required.

These grow lights will even save you energy as they consume less power and are more effective for growing plants.

However, if you plan to stick with other types of grow light that emits more heat, you will have to put in extra work to manage the excess heat.

led grow lights lumens

4. Use oscillating fans

Ensure you set up fans inside your grow tent. If you’re using a small tent, one or two portable oscillating fans are enough. If you however have a bigger tent, you will require several oscillating fans to cool down your grow tents.

As you’re planning to purchase your grow light, always add fans to these plans. The wattage of your grow light will determine how many fans to use. Higher grow light wattage will require more fans and vice versa.

5. Proper ventilation of tents

Generally, your grow tent should have proper ventilation such as inlet and outlet vents. Not just that, your grow tent should also have regular vents which may have layers of mesh covering that allow airflow. The combination of inlet and exhaust fans with these vents makes it more effective.

6. Proper ventilation for grow lights

Grow light with proper vent allows cool air to be passed across the grow light during operation. We recommend you always go for grow light that has vents on all sides. Set up the necessary fans towards your grow light vent to allow the passage of cool air across the grow light.

How to Heat Up Grow Tent

As well as cooling down your grow tent, you may also want to know how to heat your grow tent. Here are some easy ways to ensure your grow tent remains warm enough during the colder seasons.

  • Location. Try moving your grow tent inside to another room, or changing the ventilation. Doing one of these options will instantly provide warmth for your grow tent.
  • Use More Light. An easy way to get warmth is to add more light. As long as the light is evenly spread throughout your grow tent, this is a sensible option.
  • Heater. Heaters are only effective in smaller rooms as they don’t release too much heat. But if you have a small grow tent, this would be ideal.
  • Lower Your Fans. If you use your fans less often than usual, it’ll be warmer than usual. You could also install a thermostat in your grow tent, but this isn’t often recommended.
  • Air Diffuser. Create your own air diffuser by using ducting and running it around your grow tent.

How to Add AC to Grow Tent

The easiest way to add AC to your grow tent is to use a portable or small air conditioning unit. If you use one of these, you can simply wheel it into your grow tent. This is ideal if you don’t want to spend time installing AC units.

Best Small AC for Grow Tent

There’s a huge selection of portable AC units to use for your grow tent. However, I’ve found that some work far better than others in grow tents. Here are two of my favorites.

The first is the Serene Life SLPAC10 Portable Air Conditioner. It can be used as an AC unit, fan, or dehumidifier. It can cover around 500 feet and has a voltage capacity of 120V. It works best in a 5×9 grow tent. It is known for being quite a noisy AC unit, so if you’re sleeping or working near your grow tent, this unit may not be ideal. However, it’s great at reducing humidity and controlling the temperature in the tent.

The second is the Black & Decker BPACT12WT Portable Air Conditioner. It can be used as an AC unit, fan, or dehumidifier. It can cover around 500 feet and has a voltage capacity of 110V. It works best in an 8×8 grow tent. Much like the first, it is known for being noisy; but unfortunately, I’ve found this the case with most AC units. However, it’s easy to use and maintain; as well as great at controlling humidity.

DIY AC for Grow Tent

You can even make your own AC for your grow tent. To do this, you’ll need to put in time and effort and have varying equipment. For this, you’ll need the following equipment:

  • ducting
  • drill
  • hose
  • fan
  • bucket
  • cooling pads
  • water pump

Now all you need to do is:

  1. Drilling. Grab your 5-gallon bucket and fill it with 2 gallons of water. Make a mark where the water reaches and drill holes just above the line you’ve marked. Only make as many holes as you can without damaging the bucket.
  2. Cooling Pads. Cut your cooling pads to size. Around 33″x13″ is ideal. Glue together.
  3. Hose. Connect your house by using tubing to fit the size of your pump. Make holes every 1-2 inches.
  4. Water Pump. Use a 12V water pump and connect the hose to check it works adequately. Cover your 5-gallon bucket with a lid.
  5. Fan. Use a 12V fan; the lower the better, as this continually be running. You can place the fan beneath the lid.
  6. Add Ducting. Place your DIY AC unit outside the tent and add ducting to insert into the entrance of your tent.

how to heat up grow tent

Final Thoughts: How to Cool Grow Tent

With that said, we do hope you have learned some tips on how to keep your grow tent cool. Remember, for an effective result; ensure you go for more than one option or technique we listed above. Do you have any tips or tricks for cooling down a grow tent? If so, please feel free to let us know in the comments below. And remember, sharing is caring!


How hot is too hot in grow tent?

The question of whether or not there's a limit to how hot a grow tent should be has been discussed on this site many times. The problem is that the answer is different for everyone, depending on their tolerance level and what kind of grow they're doing. I've seen some grow tents that are so hot that you can barely walk into them.

I've read that the heat should be between 55-65 degrees, but there are other sources that say that the heat should be around 50-55 degrees.

How do I keep my grow tent cool?

If you were growing outside you wouldn't have to worry about keeping your plants cool. If your plants were outside they would naturally cool the air down in their leaves. 

However, in a growe tent you do need to take precautions. There are a couple of ways you can keep your grow tent cool. You can use an AC unit to cool the room, or you can use fans to circulate the air in the room. The best way to keep your grow tent cool is to use an AC unit. A properly sized AC unit will keep your grow room cool enough for you to be comfortable in the room and keep it cool enough for your plants to thrive.

It is not always easy to find the right grow tent that will suit your needs, and this affects the way that heat is dispersed throughout the inside. Many growers end up with a grow tent that does not fit their needs or they end up having to spend money on something that is not a good investment. When selecting a grow tent you should consider the following: Size You want to make sure that you purchase a grow tent that is the correct size for your needs. It is a good idea to get a grow tent that is the same size as your current grow tent.

How do I know if my plants are too cold?

Cold temperatures can cause damage to some plants. Plants that are too cold are less likely to bloom, grow and develop healthy buds and leaves. You can tell if your plant is too cold by the way it looks, whether or not its leaves are wilting and the color of the soil. 

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